https://youtu.be/xShtd6k6WGMI'm pretty sure this fight requires at least 2 things;
1 aggressive playstyle,
2 a champ that generates permanent armor up buffs,
and both should be combined. and there's no guarantee that your critical hits won't trigger backblast damage (global node).
If you have Taskmaster, you don't need to worry about all of the above. You can play safe and relax without a damn worry, because;
Plasma will not detonate on you (on the contrary it HEALS you with Willpower mastery)
Armor Break's from crumbling armor node also counts as debuffs.
Backblast incinerate will not hurt you because you already become immune.
I suggest to all Endgame players (who are not spending to crystals crazy amounts) to consider ranking him up.
There's an upcoming Havok Boss in 6.3