Tier 2 (Hero Level 4)
Runic Blast deals an additional 180 (+4% per level) damage over 3 seconds in an area around the detonation point.
Patch changes 
Edit
(Patch March 14, 2017) Note: New functionality: Detonating Runic Blast leaves a damaging field on the ground, dealing 180 damage over 3 seconds.
