What do you do with murder hobos in your RPG campaign?

The term covers two different things

"Murder hobo" gets used for any character who fights readily, but that alone is not the issue. A fighter who kills bandits during a fight the table chose to have is playing a combat-capable character, not causing a problem. A character can be cruel, reckless, or violent while the player supports everyone's fun.

The behaviour worth addressing is a pattern that clashes with what the group agreed to play: for example, repeatedly killing neutral or surrendered NPCs when other players want to talk, investigate, or make moral choices. The character's fictional morality is not the test. Ask whether the player's choices override shared expectations, other players' choices, the agreed tone, or consent around conflict within the party.

Decide whether there is a problem before you decide what to do about it

Ask these before changing anything at the table:

• Is anyone losing agency or enjoyment Did another player lose a meaningful scene or character niche? Is the behaviour making someone uncomfortable or frustrated, or repeatedly working against shared party goals? Those are table-impact questions, even if the campaign can adapt easily.
• Does it fit the agreed tone and boundaries A grimdark mercenary campaign and a cosy village mystery have different defaults for what a character does to an NPC who annoys them. Check the mismatch against what the table agreed, including any boundaries around intra-party conflict, rather than your own preference.
• Can the scenario adapt if an NPC is lost If an informant dies or a faction becomes hostile, look for other witnesses, clues, or routes forward. A campaign that adapts easily has avoided plot damage; that does not answer whether the behaviour is costing other players agency, comfort, or enjoyment.
• Is it working against shared party goals One player built a character around talking their way past a guard captain. Another kills the captain before the conversation starts. If this repeatedly denies a scene that another player wants to play, discuss that cost together.
• Is it a pattern or a session One bad night, a rough combat, a player blowing off steam, is not the same as a standing habit that shows up every session regardless of context.

Talk outside the game first

If the answer to the checklist is genuinely yes, the fix starts as a conversation, not a scene. Trying to teach a lesson through the fiction, an angry mob, a curse, a captured character, treats an out-of-game disagreement as if it were an in-game event, and the player usually reads it correctly as the GM punishing them rather than the world reacting.

A short, direct conversation outside the session works better precisely because it is honest about what is happening: the table has a mismatch, and it needs sorting between people, not between a character and an NPC.

What to re-establish in that conversation

Session 0 usually covers this once. A murder hobo conversation is where you check it still holds:

• Campaign tone What kind of consequences the world hands out for casual violence, and whether that has actually been consistent so far.
• NPC treatment What level of violence toward neutral, surrendered, helpless, or socially important NPCs fits the campaign everyone agreed to play.
• PvP and party goals Whether the party is meant to be pulling in the same direction, and what happens when one character's choices work against the others' goals.
• Character concept fit Whether the character as built can actually operate inside the campaign the table agreed to run, or whether the concept and the campaign are pulling apart.

Use consequences that fit the established world

Use consequences that follow from the established world, not consequences invented mainly to punish the player. Witnesses may report a killing, allies may lose trust, local law may investigate, or a victim's associates may react. These consequences can happen as soon as the world would respond; the out-of-game conversation is still needed to address a mismatch at the table. What follows depends on witnesses, local law, the victim's status, faction ties, who cares, and whether anyone can act on what happened. Not every violent act needs a bounty, a revenge squad, or an escalating combat response.

The common advice to just send stronger guards or bounty hunters after them treats the disagreement as a combat encounter to win. It rarely lands that way. The player either fights through the escalation, which confirms the campaign is now about them versus the world, or the table spends a session on a fight that exists only to make a point that was never about combat in the first place.

If one player keeps ignoring the agreement

Work through this in order rather than jumping straight to the last step:

• Restate the specific issue privately and plainly, not as a general complaint about playstyle.
• Agree on one concrete change you can both check for in the next session.
• If the pattern continues, revisit whether the character concept actually fits the campaign, and whether it can be adjusted.
• If the behaviour still continues after that, recognise that the player and this particular campaign may not be a good fit, which is a real outcome, not a failure to fix them.