Malkus is an Orsimer vampire and leader of a rival faction of vampires.
Malkus can be found by the magical barrier holding Dexion. He holds a Weystone Focus and must be killed in order to free the Moth Priest.
Malkus' corpse can be found by the magical barrier holding Dexion. It appears the Dawnguard, led by Vanik, stormed the cave and killed all the vampires that were holding Dexion. The Weystone Focus must be looted from his corpse in order to free Dexion.
- The Elder Scrolls V: Dawnguard (First appearance)