You can brute force your way through the last boss of POE 34, basically his add and ether consume phase don't reset but instead are sequential - he will do it at 90%, 75%, 50%, 25%, etc (and regen back to full if you don't kill enough adds). But the level "remembers" when it happened last so when you get him to 50% he won't do the next add phase until 25%, ie you can go from 100 to 25 without adds.
We were screwing around with an ammo run and just kept letting him regen to full hp and killing a new wave of adds, and ended up just killing the boss from 100 to lower every add phase. It took like 8 minutes but basically no real strat, just attack boss, when adds spawn run around and kill as many as you can, rinse and repeat. Kill the critical add when it spawns (save rockets and heavy for that). If anyone dies just stop DPSing the boss, his add phase is based on his HP not a timer so you can spend 1 minute just wandering around waiting to rez.