Become a Vampire
Crafting a Vampire's Cloak (click on "Rajesh the Crafter" in Camp or a Shop to craft) will allow the wearer to have the Vampirism skill. Vampires have their own skills : Seduce, Blood Suck, Scourge, and Vampire's Touch (default attack that lowers enemy's maximum HP). Vampires also have improved Magic Attack, Magic Defense, Physical Resistance, and immunity to Darkness damage.
Just be careful around Fire and Light damage dealers, as Vampires have a weakness to these types of damage.