Friendly Rainbow Boulder

Shimmer transmutes the plain Friendly Boulder into this one, so it costs a trip to the Aether and nothing else. Since the change runs both ways, there is no reason not to keep whichever form you feel like at the time.

It does not walk. Once you get ahead of it, it bounces after you, throwing off a rainbow streak and a spray of sparks on every landing. That gives it something almost no other cosmetic pet has, which is real light. Pets that illuminate a room are normally light pets by design, and this one is not, so you get a lantern out of a slot that usually gives you company and nothing more.

It only imitates the boulder it is named after. It will not fight anything and it will not point you at treasure. The half size sprite is deliberate, if the slightly mismatched pixels bother you.