Tier 5 (Hero Level 13)
Gall's Runic Blast reduces Cho's Rune Bomb cooldown by 1 seconds per enemy hit, and 2 seconds for each Hero hit.
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(Patch March 14, 2017) Note: New functionality: Gall’s Runic Blast reduces the cooldown of Rune Bomb by 1 second for every enemy hit. This bonus is doubled against Heroes.- (Patch August 24, 2016) Note: Cooldown reduction increased from 1 to 1.25 seconds.