Image: Rebel Wolves / Bandai NamcoOfficial screenshot from Rebel Wolves / Bandai Namco.
Vampirism holds Coen's vampire powers, which wake at night. The deeper his corruption, the more of them he can unlock. Its best powers come from drinking the blood of named vrakhiri.
The tree has three Ultimate Perks, and only one can be learnt. Unlocking one earns Creature of the Night.
Rebound Death saves you from a killing blow once per fight. Lethal Crescendo boosts claw damage after a kill. Sanguine Renewal resets your cooldowns when you feed with Voracious Bite, and guides call it the easiest one to recommend.
Scarlet Shield comes from Ambrus, Shadowstorm from Bakir, Blood Surge from Xanthe, Piercing Shriek from Brencis and Mesmerise from Lacra. Draining a Boyar after their fight is one route; phials found in quests are another.