The Injured Spitter, also known as The Mummy Spitter, is a ranged hostile entity from Pixel gun 3d.
It looks like an armless spitter, wrapped around mummified, Its Eyes and Mouth are also green, and Its Pupils and Teeth are also black, In my version, Like the spitter, it would back up away similar to the Festive Creeper.
It should be in The Trial Chambers since The School Location has Chamber like areas.