Tier 7 (Hero Level 20)
The Monstrosity gains the ability to Deep Tunnel to any visible location once every 25 seconds.
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(Patch July 12, 2016) Note: Monstrosity Deep Tunnel cooldown reduced to 25 seconds from 30.
(Patch August 18, 2015) Note: After learning the Evolution Complete Talent, Abathur’s Monstrosity will no longer retain some of the Minions Absorbed stacks earned by a previous Monstrosity.