Kodama

Kodama is a hovering glitch-core vermin that spends most of its idle time rotating in place and drifting in small noisy loops.

It becomes dangerous when the world around it changes. Taking damage angers it immediately, but even nearby block breaking or block placing can push it into attack state. Once hostile, it closes in and bursts at close range for 2 damage and heavy knockback. Water also destroys it on contact.

Kodamas appear in Digital Space, Lotus, Prison, and high-air biomes. The reliable reward is ball essence, so they are worth knowing if you want that ingredient on purpose.