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Brain Creature, screenshot from Ultima Underworld II
|Only appearance:||Underworld II|
Basically these creatures are huge, flying brains with eyes. They attack their opponents with their psychic powers, literally tearing them apart. While physically weak, they are nonetheless strong opponents.
In Ultima Underworld II, these creatures were found in the Void. Two more used their magic on Killorn Keep to keep it flying. If the Avatar destroys them, the Keep crashes to the ground, killing all inhabitants.