Sprites, known in their initial, unprototyped form as Kernelsprites, are entities released from the Cruxtruder when first opened when a person is setting up after beginning to play Sburb. Before entry and after a single, normal prototyping, the sprites appear as simplistic floating heads within the kernel. However after hatching, or a second prototyping or a special prototyping they appear in a ghost-like form possessing a tail. Despite their name and their ghostly appearance and abilities they have been confirmed to be corporeal and are considered to be alive (although arguably undead).
Sprites are meant to serve as a player's guide, but they also have functions important to a session. Despite serving as a guide sprites cannot accompany their players through The Seven Gates until they have unlocked the ability to do so at which point the sprite gives the player a pendant which they can use to summon the sprite.