Raxle Berne is an Imperial vampire in The Elder Scrolls III: Morrowind. He resides in the Dwemer Ruins in Galom Daeus and is an Ancient of the Berne Clan. If you become a vampire from another Berne vampire, he will provide some quests as he considers you to be a mistake, albeit still of some use.
After retrieving the Quarra Blood potion, Raxle Berne will send you to kill Merta, a vampire who was once a part of the Berne clan but turned rogue and left the clan. Once Merta is dead, he will give you one last task; that you kill 12 vampires belonging to Clan Quarra and Clan Aundae.
Tharer Rotheloth will task you to slay Raxle Berne in the name of the Tribunal.