BattleCast encounter test
A mind flayer encounter is a lesson in how one failed Intelligence save can swing a fight. The monster is fragile compared with big brutes, but Mind Blast can steal enough actions to make that fragility matter less.
Use this as a failed-save snowball test. A level 5 party can defeat the mind flayer quickly, but only if Mind Blast does not steal too many actions first.
Across 1,000 simulated battles from this starting layout, Level 5 party had the higher win rate. Mind Flayer won 9.0%, Level 5 party won 91.0%, draws were 0.0%, and the average fight lasted 3.6 rounds.
This setup tests whether the party can recover from a bad control round. Level 5 heroes have meaningful damage, but stunned heroes do not spend those turns.
The party begins close enough for the mind flayer to matter immediately, which makes the first two rounds more informative than a long approach on an open map.
Watch how many heroes are stunned by the first Mind Blast. One stunned hero is manageable; several stunned heroes can make the encounter look much more dangerous.
Also watch whether the mind flayer gets to follow up on a controlled target. That is where the monster stops being a caster and becomes a horror encounter.
Tune the mind flayer through spacing and backup threats.