Increase the damage and Healing of Swarm by 16%, but reduce its duration by {scale=0.35|0.35}s.
Level 4
Charmed
Blood Hex
Increase your ally's Movement Speed by 8% while they are marked by Blood Hex.
Level 2
Tainted Form
Weapon
Gain 3% of Max Health when hitting a marked enemy.
Level 3
Sanguine Pact
Death Wings
Reduce the Cooldown of Blood Hex by 1.5s after activating Death Wings.
Level 3
Convenient Leech
Swarm
Reduce the effect of Crowd Control for allies within Swarm by 15%.
Level 3
Maelstrom of Carnage
Swarm
Swarm is now cast on yourself and follows you around instead of being placed on the ground, its ability cost is decreased by 25%, and its radius is increased by 30%.