Dark

Dark is a type of energy created when a cryptid is suffering. It can be used to amplify a cryptozoologist's physical attributes. Dark has been shown to be very addicting: in Maddest Investigator the Maddest Cryptozoologist refuses to give Eighter a Grand badge due to the Dark inside it, comparing it to "being an addict in a trap house" and calling her "Addict-fuck". It can be fused with Fuksu and Nofuksu to create Kurai.