Aoe debuffs huge swathes of enemies instantly for 6000 armor due to self-synergies. Adds critical damage taken to enemies too, which adds alot of group utility. Ultimates are also the most powerful group-buff ultimates in the game. Preferably standard of might should be used.
Mostly alkosh and EC will make sure there is no downtime on pen and critical damage cap
Skill rotation:
Before engagement
1. Hurricane
2. Skeletal Archer
3. Flames of oblivion
In fight
1. Stampede
2. Lightning Flood (then immediately use its synergy)
3. Blighted blastbones
4. Engulfing flames
5. Chains of Devastation
6. Blighted blastbones
7. Burning embers
8. Unnerving Graveyard