Sinister Acorn

The Sinister Acorn is a Transformation tool that rarely drops from all types of Squirrel. When used, it transforms the user into a Squirrel. While transformed, the player can fit through 1-block tall gaps and has a top speed of 25 miles per hour, but cannot use items with the exception of Soul Link.

Like other Transformation items, it can go into the Mount equipment slot, and as such cannot be used while the player is on a Mount.