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Created for the duration of a battle with SpawnParasite. As with all other Summoned units, it is created with stats derived from the summoner's size and Magic.
Parasites aren't very strong, but they can support your team by Poisoning enemies at range with Toxin before sacrificing themselves with GrassExplosion or ParasiteAttach, the former dealing poison damage in an area and turning non-lava tiles to grass, and the latter inflicting Poison and Slow on a single target.