We could have it effect thundercrash too.
Top tree:
Big fist of havoc, when in the air long enough release a shockwave that travels along the ground and damages enemies in its path.
Middle tree: thundercrash can fly a little longer and each second it flies for increases its damage by 25%.
Auto detonate on super bar being empty.
Bottom tree:
Can do a ballistic slam in super to close large gaps quickly.