Thrall

Crash Lightning  at 1 for the 4man,  Echo of the Elements  for solo lane.  Ancestral Wrath  at 7 vs high HP targets, % dmg and good self heal. Ults should be picked depending on what you think is best against enemy team comp, for burst pick   Sundering  and for CC Earthquake . At 16  Thunderstorm  offers good synergy with  Crash Lightning   but can be awkward to stack,  Alpha Wolf  offers more % dmg.  Earthen Shields  at 20 can offer team support if you need that over increased dmg.