Demonic Inquisition Heroic - Elemental Shaman PoV
Despite having two targets up the whole fight, you'll play this as Ascendance as CL cleaving will still trigger stacks of Torment if it hits the boss with Bone saw/Fel Squall.
Get yourself a couple of WA to monitor for these two buffs popping up but apart from that it's just nuke them down.
A note for being inside clearing your Torment stacks; the mini-boss can't be tanked by your earth elemental so unfortunately you can't stay down there when the tank leaves.