Delayed Delirium
One of the many things in which Malkavians delight is seeing ostensibly sane individuals suddenly be overcome with madness. the refined version of Kiss of the Moon implants a Derangement of the vampire's choice in any victim, mortal or Cainite, to be released at a later date. Many a vampire has used this power to trigger insanity in a target to coincide with meticulous plans - just as many others have applied it purely on a whim.
System: The vampire must make eye contact and speak to the victim, describing the Derangement he wants the target to manifest. The dialogue may be interspersed in an otherwise innocuous conversation, but this raises the Malkavian's difficulty by one. The Cainite also describes the circumstances under which the Derangement triggers - anything from "When you next see your wife" to "a fortnight hence." the player makes a resisted Manipulation + empathy roll against the victim's current Willpower rating. If one success is scored, the victim manifests a Derangement of the Malkavian's choice at the indicated time, which lasts for one year. Two or more successes make the Derangement permanent.