Major Form Toggle: Shroud yourself in the Abyss, which will grant you unholy power - at a cost.
You gain +2 Charisma, +10 Negative Healing Amplification, and +10 Negative Spell Power. You have +100% critical hit resistance, are healed by Negative Energy, take 50% healing from Positive Energy, and take double damage from Light. You are considered Undead rather than your original type for the purposes of most effects.