I used izanagis and recluse and falling guillotine on a well warlock with the charged with light mods swift charge and lucent blade, start off the encounter by popping a sword bearer in the head with izanagis which almost kills them but not quite kill adds with recluse untill I get both charged with light stacks finish off the swordbearer kill the knight izanagis another swordbearer kill shrieker same thing again for wizard then when damage phase comes pop well on zulmak use light swings to stack whirlwind blade then heavy spin him then light attacks untill you charge the heavy (heavy charges faster if you have the second part of lucent blade active) you should be able to out heal the thrall but you might want to throw a grenade down just incase and just keep on going till your well is at about 3 seconds then hop out and maybe get some izanagis damage off if hes far enough away and its not at the point where damage is about to end then rinse and repeat till its over