U4GM How to Solo Echo of Mephisto With Paladin Merc

If you've tried to solo the Echo of Mephisto in Season 13, you'll know the fight doesn't care how confident you felt walking in. You can have tidy resist rolls, clean aspects, and a stash full of Diablo 4 Items, and still get flattened in ten seconds if you treat it like a normal boss. I made that mistake early on. I kept chasing more damage, thinking one better burst window would fix...