Scáth- creatures conjured by magic that haunt the Territory of Emlék. Made of shadows, they take the form of someone who you love, someone who has hurt you, someone you have hurt, someone you couldn't save, etc.
In worlds that Chaos conquers the Phase energy becomes corrupted. This corrupted energy will often become these things, commonly called Chaos creatures or Corrupts. When these creatures are 'killed' their energy cycles through the Phase again and becomes uncorrupted. In order to reclaim a world from Chaos all of the creatures must be destroyed.