Session Zero vs First Session: When to Cover What

Session Zero and Session One serve different purposes, but the boundary between them does not need to be rigid.

Session Zero is primarily about establishing the campaign before regular play begins. It gives the group an opportunity to discuss expectations, create or coordinate characters, establish boundaries, explain important rules, and handle practical logistics.

Session One is the first regular play session. It is where the campaign begins delivering the experience everyone discussed.

Understanding the distinction helps Game Masters avoid two common problems: spending the first adventure trying to settle foundational questions that could have been discussed earlier, or turning Session Zero into such an exhaustive preparation exercise that everyone is tired before the game begins.

The goal is not to enforce two mandatory meetings.

It is to know which conversations should happen before they become relevant during play.

Why the Distinction Matters

The current Dungeons & Dragons rules describe Session Zero as an initial gathering focused on creating characters and setting expectations, including subjects the group wants to avoid or embrace. It is also an opportunity to decide whether the characters know one another, how they met, and what kinds of quests they might pursue together.

That makes Session Zero primarily an alignment and preparation space.

Session One has a different job.

It begins testing those agreements through actual play.

Players make decisions.

Characters interact.

The GM adjudicates rules.

The world responds.

The campaign begins producing consequences.

These purposes can overlap. A Session Zero might end with a short introductory scene, and a Session One might begin with a few remaining administrative questions.

That is fine.

Problems arise when important expectations remain unresolved until they unexpectedly collide with play.

What Belongs in Session Zero

Session Zero should cover information that players reasonably need before creating characters or participating in the campaign.

The exact checklist depends on the group.

Campaign Pitch and Buy-In

Explain what campaign you are offering.

Players should understand enough to decide whether the premise interests them and whether their character concepts fit.

Cover topics such as:

• Game system and rules version
• Campaign premise
• Starting situation
• Expected tone
• Major themes
• Likely forms of play
• Expected campaign structure
• Starting level
• Important character restrictions
• Major house rules
• Approximate schedule

Suppose you are planning a seafaring campaign in which four merchant houses compete for control of oceanic trade.

Players might need to know:

• The campaign centers on maritime travel and political competition.
• Characters will spend significant time aboard ships and in port cities.
• The houses are politically powerful.
• Combat, exploration, negotiation, and investigation can all matter.
• Characters begin as people connected to one of the trade routes.

They probably do not need the complete economic history of every merchant house before creating characters.

Give them information that helps them make decisions.

Let less important lore emerge later.

Character Creation and Party Cohesion

Session Zero is an excellent opportunity to create characters together, but character sheets do not necessarily need to be completely finished during the meeting.

The more important goals are establishing:

• Character concepts
• Campaign compatibility
• Party relationships
• Reasons for cooperating
• Major mechanical expectations
• Any restricted or encouraged options

For the merchant-house campaign, players might decide that their characters already work aboard the same vessel.

One could be a navigator.

Another might be a shipboard healer.

Another might represent the merchant house whose cargo they transport.

Another could be a former naval officer serving as security.

These connections immediately answer an important question:

Why are these people together?

Players do not have to create mechanically complementary characters unless the group wants that style of play.

If several players choose similar specialties, the GM can point it out without treating party composition like a required MMO role system.

For example:

"It looks like several of you are building socially focused characters. That's completely workable. I just want to make sure that's intentional before everyone finalizes their characters."

The goal is awareness, not mandatory party optimization.

Character Relationships

Ask how the characters know one another.

Possibilities include:

• Family
• Former military service
• Shared employer
• Childhood friendship
• Professional rivalry
• Mutual enemy
• Shared mentor
• Previous expedition
• Debt
• Membership in the same organization

Characters do not need to begin as close friends.

They need enough reason to participate in the same campaign.

Safety Tools and Content Boundaries

Session Zero is an appropriate time to discuss content expectations because the group can establish procedures before difficult material appears unexpectedly.

Possible approaches include:

• Lines and Veils
• The X-Card
• Script Change
• Consent checklists
• Private communication
• Open-door or pause procedures
• Other systems the group understands and agrees to use

The TTRPG Safety Toolkit, co-curated by Kienna Shaw and Lauren Bryant-Monk, provides a collection of established tools that groups can review.

No single named tool is mandatory.

The important questions are:

• What material should not appear?
• What material can exist but should remain off-screen?
• How can someone pause or redirect play?
• Can players communicate concerns privately?
• Can boundaries change later?

The answer to the final question should be yes.

Session Zero does not permanently lock anyone into their original comfort level.

For the seafaring campaign, someone might ask that drowning be handled without graphic description.

Another player might want interrogation scenes to avoid detailed torture.

The GM does not need personal explanations for those requests.

They need enough information to respect them.

House Rules and System Choices

Explain rules that materially change what players would otherwise expect.

Examples include:

• Character creation restrictions
• Optional rules
• Homebrew subclasses or species
• Rest modifications
• Encumbrance rules
• Naval combat systems
• Resurrection rules
• Advancement method
• Critical-hit modifications
• PvP procedures

Also discuss how uncertain rules will be handled.

Rather than forcing a false choice between "rules as written" and "narrative first," establish a practical procedure.

For example:

1. Look up the rule if it can be found quickly.
2. If finding it would substantially interrupt play, make a temporary ruling.
3. Research the issue afterward.
4. Clarify how the group will handle it going forward.

Different groups may prefer different procedures.

What matters is consistency and clarity.

Player-versus-Player Expectations

If relevant, discuss what happens when player characters conflict.

Clarify whether players may:

• Attack one another
• Steal from one another
• Conceal important information
• Betray the party
• Use social abilities against one another
• Make major decisions affecting another character without player agreement

Characters can surprise each other without requiring players to be blindsided by unwanted PvP.

Make the distinction clear.

Logistics and Communication

Campaigns need schedules as well as stories.

Discuss:

• Session frequency
• Start time
• Expected duration
• Location or online platform
• Minimum attendance required to play
• Cancellation procedures
• What happens to absent characters
• Communication channels
• Scheduling expectations

For example:

"We play every other Tuesday at 7:00 PM. If one player is absent, we continue. If two or more cannot attend, we reschedule."

Another group might choose a completely different policy.

The important part is knowing before the conflict occurs.

What Belongs Primarily in Session One

Once the campaign's foundation is established, Session One should begin delivering on it.

That does not necessarily mean starting with an explosion, combat encounter, or emergency.

It means giving players meaningful opportunities to participate in the campaign they agreed to play.

The Campaign's Opening Situation

Session One should give the characters something to engage with.

In the merchant-house campaign, the opening might be:

House Veldrin's flagship returns unexpectedly.

Its cargo holds are empty.

Several crew members are injured.

The captain claims ships flying the colors of rival houses attacked without warning.

The harbormaster has ordered the vessel impounded until an investigation can be completed.

That situation introduces:

• Political tension
• Maritime conflict
• Investigation
• An immediate decision
• Several possible approaches

The players could:

• Question the crew
• Investigate the ship
• Negotiate with the harbormaster
• Contact House Veldrin
• Sneak aboard before authorities secure it
• Investigate the rival houses
• Ignore the official problem and pursue another lead

The hook creates opportunity without dictating the solution.

Meaningful Player Choice

The first session should give players opportunities to make decisions that matter.

That could happen through:

• Combat
• Investigation
• Negotiation
• Exploration
• Character interaction
• A moral decision
• Choosing between competing opportunities

The type of decision should reflect the campaign pitch.

If Session Zero promised political intrigue, Session One should probably contain something political.

If the campaign was pitched as dungeon exploration, the group should probably reach meaningful exploration quickly.

If the campaign emphasizes character drama, quiet interpersonal scenes may be completely appropriate.

The first session does not need action for action's sake.

It needs relevance.

Introduce the World Through Play

Session Zero explains the campaign.

Session One lets players experience it.

Instead of giving a long lecture about the merchant houses, show their influence.

A dockworker lowers their voice before mentioning one.

A customs officer changes their ruling after seeing a house seal.

A rival merchant receives preferential treatment.

A tavern owner refuses to serve someone wearing the wrong colors.

The players are now learning how the world functions through interaction.

Setting information tends to become more memorable when players have a reason to care about it.

Establish Table Rhythm

The first few sessions teach the group how this particular campaign feels.

Players begin learning:

• How quickly scenes move
• How often the GM asks for rolls
• How much freedom they have
• How NPCs respond to unusual ideas
• How combat runs
• How the GM handles uncertainty
• How much character conversation fits naturally
• How consequences develop

Session Zero can describe these things.

Actual play demonstrates them.

Topics That Can Belong in Both

The distinction between Session Zero and Session One should not become artificial.

Some subjects naturally cross the boundary.

Learning the Rules

New players do not need to understand every rule before Session One.

Session Zero can explain:

• Basic character concepts
• Core dice mechanics
• What characters can generally attempt
• Important table procedures

More detailed rules can be taught when they become relevant.

A first-time player often understands opportunity attacks more easily when one actually occurs than when receiving a twenty-minute lecture about them before play.

Rules learning can continue throughout the campaign.

Finishing Characters

A player may leave Session Zero with:

• Class chosen
• Species chosen
• Background chosen
• Ability scores assigned
• Character relationships established

but still need to:

• Select spells
• Choose equipment
• Write personality notes
• Confirm a feat
• Finish a backstory

That is usually fine.

Complete whatever is necessary before the relevant part of Session One.

Safety Reminders

Safety procedures belong in Session Zero, but they remain active during play.

If Session One contains material near an established boundary, a brief reminder may be appropriate.

For example:

"Just a reminder before we start this scene: anyone can pause or redirect at any point."

That is not redundant administration.

It reinforces a procedure the group has already established.

New Information

Sometimes something genuinely new appears during Session One.

A player might realize:

"I didn't expect that to bother me, but I'd rather not continue with it."

The correct response is not:

"We already did Session Zero."

Boundaries and expectations can change.

Adjust accordingly.

Common Mistakes and How to Avoid Them

Trying to Complete Everything Before Play

Session Zero does not need to resolve every possible question the campaign might ever face.

You probably do not need to establish:

• Rules for level 15 abilities in a level 1 campaign
• Policies for naval combat if the campaign may never reach the ocean
• Every faction relationship
• Every future character arc
• Every possible content scenario

Handle what is relevant.

Add new agreements when circumstances change.

Rushing Character Creation

Starting Session One with completely undeveloped characters can create avoidable confusion.

But the problem is not simply unfinished character sheets.

The more important issue is whether players understand:

• Who their characters are
• Why they are participating
• How they connect to the campaign
• How they relate to the party
• The mechanics needed to begin playing

A few unselected equipment options are less important than a character who has no reason to participate.

Overloading Session Zero With Lore

Players need context, not an encyclopedia.

For the merchant-house campaign, explain:

• The four houses
• Their broad areas of influence
• Why they matter
• The campaign's starting political situation

Save:

• Founding dates
• Detailed genealogies
• Minor historical conflicts
• Complete trade-route statistics

for when those details become relevant.

Players who love lore can always receive optional deeper material.

Turning Session One Into Another Planning Meeting

Some unresolved topics will inevitably appear.

That is normal.

The problem occurs when most of the first play session is consumed by questions that could reasonably have been handled before play.

If everyone spends the opening hour deciding:

• Whether PvP is allowed
• Which books are legal
• What campaign they are actually playing
• How often they can meet
• Whether certain subject matter is acceptable

then the group is effectively still conducting Session Zero.

That is not a disaster.

Finish the necessary conversation.

Document the decision.

Then begin play.

The lesson is simply to include those topics earlier next time.

Assuming Session One Must Begin With Combat

A dramatic opening can be effective.

It is not mandatory.

A campaign about political intrigue might begin with a formal dinner.

A mystery might begin with an interview.

A character-driven campaign might begin with everyone traveling together.

A wilderness campaign might begin at the edge of unexplored territory.

What matters is that something meaningful is available for players to engage with.

Beginning With Scenes That Do Not Demonstrate the Campaign

The more significant mistake is opening with material unrelated to what was promised.

If the campaign was sold as maritime exploration but the first three sessions consist entirely of unrelated shopping and tavern conversations, players may reasonably wonder when the campaign actually begins.

The opening does not need spectacle.

It should establish direction.

Adjusting for Campaign Length

Session Zero should scale with the commitment involved.

One-Shots

A one-shot may only need a short pre-game conversation covering:

• Premise
• Characters
• Tone
• Relevant boundaries
• Important rules changes
• Expected duration
• PvP expectations

With pre-generated characters, this might take only a few minutes.

Short Campaigns

A four-session adventure might combine Session Zero and Session One.

For example:

First 45 minutes

• Introductions
• Campaign pitch
• Content boundaries
• Character connections
• Major rules
• Logistics

Short break

Remaining session

• Begin play

There is nothing inherently wrong with this approach.

The preparatory conversation is still functioning as Session Zero even if it happens immediately before Session One.

Long Campaigns

A campaign expected to last months or years usually justifies a more substantial alignment conversation.

There are more opportunities for:

• Scheduling conflicts
• Character arcs
• Tone shifts
• Complex house rules
• Long-term interpersonal dynamics

Spending more time establishing the foundation can therefore be worthwhile.

That does not mean every long campaign requires a three-hour Session Zero.

Scale the meeting to what the group actually needs.

Bridging Session Zero and Session One

The time between the two is useful.

Send a Short Recap

Record important decisions from Session Zero.

That might include:

• Campaign premise
• Tone
• Character relationships
• Major house rules
• Scheduling
• Attendance policy
• Content boundaries
• Safety procedures
• Session One date
• Anything players need to finish

Be careful with private information.

If someone privately requested a boundary, document the resulting campaign restriction rather than who requested it or why.

Answer Character Questions

Players often think of new questions after Session Zero.

They might ask:

• Does my character know this faction?
• Could my family come from this city?
• Would my background give me contacts here?
• Can I change one spell?
• Does this organization exist?

Answering those questions before Session One can strengthen character connections without requiring another meeting.

Prepare From What Players Told You

Use Session Zero feedback.

If players were excited about political maneuvering, prepare NPC motivations and competing interests.

If exploration generated the strongest reaction, make discovery meaningful.

If players built strong character relationships, give those relationships room to appear.

Session One should feel connected to the conversation everyone just had.

Give Players an Optional Prompt

A simple pre-session question can help players arrive ready to participate.

For example:

• What does your character hope to accomplish first?
• What does your character want from another party member?
• What question about the setting interests your character?
• What is your character worried might happen?

Keep it lightweight.

It should create ideas rather than homework.

When to Revisit Session Zero Topics

Session Zero is the beginning of expectation-setting, not the final opportunity to discuss it.

Revisit agreements when:

• A new player joins
• The campaign changes tone
• A new story arc introduces different subject matter
• Major house rules change
• The group changes schedule
• PvP becomes relevant
• A safety concern appears
• Someone requests a check-in
• The campaign returns after a long break

A brief recalibration may be enough.

You do not need to repeat the entire original Session Zero.

Ask only what has become relevant.

Some groups informally call these later conversations "Session Zero Point Five" or similar terms.

The label matters less than keeping communication available.

How The Dungeon Trainer Can Support the Transition

Digital campaign tools can help preserve the information established during Session Zero and support the campaign once Session One begins.

The Dungeon Trainer supports campaigns run by a human Game Master while maintaining shared campaign state and records.

Human-run campaigns can use the platform for:

• Character sheets
• Dice
• Hit Points
• Conditions
• Initiative
• Combat state
• Shared transcripts
• Campaign continuity

AI participation remains optional.

The platform can also preserve campaign information such as:

• Characters
• NPCs
• Locations
• Quests
• Events
• Important established facts

That makes it useful for carrying information from preparation into actual play.

For example, character relationships established during Session Zero can remain part of the campaign record once Session One begins.

A house rule or campaign assumption can be preserved in notes rather than relying on everyone's memory.

Sensitive information should still be handled carefully.

Do not store private explanations for player boundaries simply because a digital tool provides a place to record information.

Preserve what the campaign needs.

Avoid storing personal details the campaign does not need.

Technology should support the group's agreements, not replace the conversations that create them.

Making Both Meetings Count

Session Zero and Session One work best when each has a clear purpose.

Session Zero asks:

• What campaign are we playing?
• What expectations do we share?
• What characters belong in it?
• Why are those characters together?
• What content belongs or does not belong?
• How will the table operate?
• When and how will we play?

Session One asks:

• What is happening?
• What do the characters do?
• What choices matter?
• How does the world respond?
• What happens next?

They are connected rather than competing.

Session Zero establishes the foundation.

Session One begins using it.

The merchant-house campaign works because the group understands the maritime political premise, the characters already have reasons to cooperate, important boundaries and rules are known, and the opening situation gives them something meaningful to do.

That does not require an elaborate ceremony.

It requires communication before the relevant decisions become problems.

Treat Session Zero as preparation for play rather than an administrative obstacle.

Treat Session One as the beginning of the campaign rather than another orientation meeting.

Then allow the boundary between them to remain flexible enough to fit the needs of your actual table.

Sources and Further Reading

Chinn, C. (2010, March 27). The Same Page Tool. Deeper in the Game. https://bankuei.wordpress.com/2010/03/27/the-same-page-tool/

Monte Cook Games. (2019, September 11). Consent in gaming. https://www.montecookgames.com/consent-in-gaming/

Shaw, K., & Bryant-Monk, L. (n.d.). TTRPG Safety Toolkit. https://ttrpgsafetytoolkit.com/

Shea, M. E. (2018). Return of the lazy dungeon master. Sly Flourish.

Shea, M. E. (2021, April 5). Running session zeros. Sly Flourish. https://slyflourish.com/runningsessionzeros.html

Wizards of the Coast. (2024). D&D Beyond Basic Rules: Creating a character. D&D Beyond. https://www.dndbeyond.com/sources/dnd/br-2024/creating-a-character