A form of poisonous, caterpillar-like beast. They're evil. They'll attack people on sight just because they can, for the sake of bringing misery. Beginner Signers are advised to beware of them when venturing into forests.In-game description
The IosGrubb is the Stage 1 form of the Ruin group.
An IosGrubb can be evolved from a Ruin Egg. It can evolve into three different forms: