How is it done
    To commit Diablerie the vampire must drink all of the blood remaining in the victim and then continue to drain.  This requires a Body roll difficulty 15 + 2 per blood volume point over full the vampire committing diablerie is.  The character must accrue 5 successes in an extended action.  If the character at any point has more flubs than successes (total) the soul is considered to have drained away first and the character gains no benefits.

What are its Effects
Note 1: Mummies and Immortals cannot be Diablerized.
Note 2: The diablerist may also gain mental or supernatural merits and flaws from the victim at the storyteller's discresion.
Note 3: The only effect that carries over to Childer is that of lower generation and becoming a Fairykin.  This is not a justification for the creation of a bloodline.
Note 4: the effects are substantially different depending on the supernatural nature of the victim.  Therefore, each creature has their own list of effects.  You can simply scroll through them all or you may link to individual sections by following the links that follow.  Victim is: Cainite Vampire, Demonkin, Fairy or Fairykin, Lillanite Vampire, Psychic, Spirit, or Werecreature

• Victim is Cainite Vampire
• If the victim is of lower generation than the diablerist then the diablerist's generation lowers by one.  A number of vampires equal to the generation difference between the victim and the lowest generation diablerist may diablerize a single vampire.
• The diablerist gains temporary effects that last until the blood fades from the diablerist's system.  Temporarily the diablerist gains:
• Every discipline the victim had over 3 dots is added to the diablerist's character sheet. *
• The diablerist gains the clan flaw of the victim's clan.
• The diablerist also gains additional permanent affects based upon the victim.  The diablerist gains permanently:
• 1 dot in all disciplines that the victim has higher than the diablerist (including any that the diablerist did not have at all) *
• The aspect of the clan flaw present in all revanents of that clan.
• Add the victim's permanent Beastial rating to the diablerist's temporary Beastial rating **
• Victim is Demonkin
• The diablerist gains temporary effects that last until the blood fades from the diablerist's system.  Temporarily the diablist gains:
• Every discipline the victim had over 3 dots is added to the diablerist's character sheet. *
• The diablerist also gains additional permanent affects based upon the victim.  The diablerist gains permanently:
• 1 dot in all disciplines that the victim has higher than the diablerist (including any that the diablerist did not have at all) *
• The magic resistance and magic sensitivity of the victim.
• The Wanderer passion rating system to the character sheet of the diablerist.
• Add the victim's permanent Beastial rating to the diablerists temporary Beastial rating **
• Victim is Fairy or Fairykin
• The diablerist becomes a Fairykin vampire (if the diablerist is already vampiric of course).  Fairykin merits and flaws may be added to the diablerist's character sheet as appropriate for the fairy/fairykin victim and any ancestry of the diablerist.
• If the victim is a vampiric fairykin add all normal effects for vampiric victims.
• Add 1 Temporary Beastial to the diablerist's character sheet.
• If the victim is also a vampire you must add the victim's Beastial rating as listed with the notes on vampires.
• Victim is Lillanite Vampire
• If the victim is of lower generation than the diablerist then the diablerist's generation lowers by one.  A number of vampires equal to the generation difference between the victim and the lowest generation diablerist may diablerize a single vampire.
• The diablerist gains temporary effects that last until the blood fades from the diablerist's system.  Temporarily the diablerist gains:
• All of the Gifts of that Lillanite vampire victim
• All three of the Lillanite family curses
• The diablerist also gains certain permanent effects based upon the victim:  The diablerist gains permanently:
• The Lillanite Family Gift
• Up to five additional Gifts that the storyteller sees as very important to the victim
• One of the Family curses (storyteller discresion as to which one)
• Add the victim's permanent Beastial rating to the diablerist's temporary Beastial rating **
• Victim is Psychic
• Add temporarily all psychic Gifts that the victim possesses.  These Gifts are completely beyond the character's control.  The character may only spend willpower to turn them off.  Treat these Gifts as Beast controlled Gifts when the character is out of control.
• Add permanently all potential psychic Gifts that the victim possessed to the Diablerist's character sheet.
• Add permanently all Awakened psychic Gifts to the diablerist's character sheet at 1 dot.
• Victim is a spirit (the victim must be on the same plane of existence as the diabolist)
• Add temporarily all psychic Gifts that the victim possesses.  These Gifts are completely beyond the character's control.  The character may only spend willpower to turn them off.  Treat these Gifts as Beast controlled Gifts when the character is out of control.
• Add permanently all Awakened psychic Gifts to the diablerist's character sheet at 1 dot.
• Victim is Werecreature
• Add the victim's current Rage (likely to be high considering the circumstances) to the diablerist's temporary Beastial Rating. **
• Add the Werecreature Species Gift permanently to the diablerist's character sheet.