This spell is a part of the Fang spell chain and can be found in the Fang rune stone.
This dark spell temporarily transforms the target into a vampire. Craving blood, the target is unable to cast spells. However, the target's power stat as well as offensive and bow power double. The target's speed also doubles and gains +2 to every Speed trait. Each physical attack the transformed does drains 10% from their target's vitality to restore the transformed's vitality. Once the spell is done, the target changes back to normal but always has a slight craving for blood. Whether or not the once transformed acts upon it is up to the target. There are stories of this spell becoming a permanent curse...
Armor Effect: Nightwalker's Curse (Overgarment Only)
Every time you spill blood you get a +2 to your damage for the next 1d6 rounds. This stacks, so if you hit the target 5 times it becomes a +10.
Serenity's Protection