Ectoplasm

Ectoplasm is a transluscent goo left behind when matter from the Nevernever enters the mortal realm without a will to give it physical form. This will quickly evaporate, leaving no trace behind.

Examples:

 * Demons must gather energy to themselves to take form in the mortal world; when they are destroyed or caught off from the source of their power, that matter dissolves into ectoplasm.


 * Dust particles that drift through a portal between the Nevernever and the mortal realm will turn into ectoplasm.