zahar0z
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What about giving the boss abilities that protect against debuffs from the Dungeon faction? Armor (armor reduction), Ice Calm (berserk), Unending Strength (weakness). After all, the boss should have some protection, and in Heroes 6, there's an ability called Defiance for this purpose.
Added 1 minute ago
Only against weakening and mind control. So, it should still be possible to reduce armor and slow down. Perhaps it's worth adding something about armor as well.