Wayang Kulit is an Indonesian magic book that allows the user to manipulate everything related to shadows, including but not limitated to, summoning and controling supernatural beings, deep levels of telepathy, umbreokinesis (shadow manipulation) and so on. The supernatural beings that can be summoned and controlled include ghosts and shadow creatures, though the guardian used normal human beings in black slinkys because they are far easer to control. The only limitation of the book is that the user must be able to read and speak the Indonesian language the book is written in.