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A walkthrough: Goblin ambush for a big party

Imagine you're running a published adventure that calls for four goblins against four level-1 characters. Your table has six players. If you run the encounter as written, the goblins will be overwhelmed before they get a second turn. Here's how to fix it with EncounterForge.

Set the party to six characters at level 1. Add four goblins (CR 1/4). The gauge will likely show Trivial or Easy. Now bump the monster count slider to 150%, which gives you six goblins. The gauge shifts toward Medium. But six goblins all attacking at once might drop a wizard in round one. Try instead setting the count to 125% (five goblins) and bumping HP to 130%. The gauge lands in Medium, and the fight will last longer without being as swingy.

You can also swap one goblin for a goblin boss (CR 1) and keep three regular goblins. The single tougher monster changes the action economy less than adding more bodies, but raises the threat level. The gauge helps you compare these options side by side.

Three mistakes GMs make when scaling fights

• Adding too many monsters. Action economy is the biggest lever in combat. Going from four to eight goblins doesn't double the difficulty; it can triple it because the party gets buried in attacks. Use the count slider in small increments and watch the gauge.
• Maxing out HP without adjusting damage. A monster with double HP but normal damage becomes a slog. The fight drags, players get bored, and nobody feels threatened. If you raise HP, consider lowering damage slightly, or vice versa, to keep the fight dynamic.
• Ignoring the environment. This calculator doesn't account for terrain, but you should. A fight on a narrow bridge with a pit below is harder than the same fight in an open field. If your encounter has a strong environmental advantage for the monsters, treat the gauge result as one band lower than it shows.

When to ignore the numbers

The gauge is a math tool, not a storytelling tool. Some of the best encounters are Deadly on paper but give the party clever ways to avoid the fight entirely. A red dragon against a level-5 party looks impossible, but if the room has a collapsing ceiling trap the players can trigger, the numbers don't tell the whole story.

Use the gauge as a sanity check, not a straitjacket. If your players love hard fights and build optimized characters, you might routinely run encounters one band higher. If they prefer roleplay and puzzles, stick to Easy and Medium and let the combat serve the story.