Brain Squid can be found in the following locations: Secret Library (energy section).

Brain Squid has 18000 hitpoints. It is immune to energy and holy damage. It is weak against death damage. It can neither be summoned nor convinced.

Brain Squid yields 17672 base experience points. Its loot can include violet crystal shard, platinum coin, glowing rune, instable proto matter, energy ball, energy bar, energy drink, odd organ, frozen lightning, inkwell, small ruby, violet gem, blue crystal splinter, cyan crystal fragment, ultimate mana potion, piece of dead brain, wand of defiance, lightning headband, lightning pendant, might ring, slime heart, collar of red plasma, collar of blue plasma, collar of green plasma, ring of red plasma, ring of blue plasma, and ring of green plasma.