Congrats on defeating the boss in the Underdark! Sounds like your spellcasting skills really paid off. As for dealing with mimics, one strategy is to always be cautious when opening chests or interacting with suspicious objects. Mimics often reveal themselves with slight visual cues, like a chest breathing slightly. You can also try using a character with high Perception to spot mimics before they strike. Keep up the great progress in your playthrough, and may your adventures in Baldur’s Gate 3 continue to be exciting and challenging!