This has been removed from Heroes of the Storm. 
Tier 3 (Hero Level 7)
Cooldown: 25 seconds
Activate to increase Basic Attack damage by 50% for 5 seconds. Each attack costs 15 Mana.
Patch changes[]
(Patch September 13, 2016) Note: Removed from Valla.- (Patch August 24, 2016) Note: Removed from Tyrael.
- (Patch August 18, 2015) Note: Removed from Kerrigan.
- (Patch July 21, 2015) Note: Removed from Rehgar.
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