Increase the Radius of Swarm by 10%, but increase its cost by {scale=3|3}%.
Level 5
Charmed
Blood Hex
Increase your ally's Movement Speed by 4% while they are marked by Blood Hex.
Level 1
Waning Moon
Blood Hex
Reduce the Blood cost of Swarm by 20% while an ally is marked by Blood Hex.
Level 4
Convenient Leech
Swarm
Reduce the effect of Crowd Control for allies within Swarm by 15%.
Level 3
Symbiotic Relationship
Swarm
Increase the Healing allies receive from Swarm by 8%, but increase its cost by {scale=4|4}%.
Level 2
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%.