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Grass Demon is the name given to a creature by Sword Finn that originated from the Grassy Wizard's cursed sword. The demon first appears briefly in "Reboot", and then in a flashback in the episode "Two Swords" where it describes itself as "a curse, an emissary from beyond" before helping Sword Finn escape from inside the Finn Sword.
The demon is a small creature, roughly the size of a human head, that resembles its personal description as "some kind of grass octopus-spider".
From its initial appearance, the Grass Demon maintains a calm and a somewhat cheerful disposition. It seems to enjoy covering surfaces with a sticky substance similar to spider silk as it coated "interior" of the Finn Sword with its webs.