MBlade with Guard of Wuthering Snow 4pc + Giant Tree Planar + E0S1 DHPT (its enough?)
Forgot to show Eidolons: E2 Ashveil and E1 Sunday.
I didn't play the best since I was trying to prolong the fight to test the limits of this build, and it seems like it actually works! It's not perfect, but it gets the job done. I've done the math, and Blade gets around 13% HP every turn he's below 50% because of the 4pc and the Outgoing Healing from the planar and his own Incoming Healing trace (8% * 1.50 + 0.12, roughly 13%)
The other part of the equation is S1 DHPT. His S1 provides around 400+ (if 4000+ ATK) healing per ult, with another 400+ to the lowest HP ally. So 800 or so healing for Blade is quite nice, but that latter half of 400 healing is a bit mischievous at times. You need to make sure that Blade, numerically, has less HP than Ashveil. Since Ashveil is so squishy, if you don't time it right, Ashveil is gonna eat up that healing even though he never took any actual damage during the fight. My Ashveil has around 2800 HP, so I just have to use DHPT ult whenever Blade is below that.
Of course, you could probably sub out the planar set for the Bone planar since it would change it from 13% to 12% HP per turn, which is manageable. That would probably be best since changing out his 4pc did sacrifice quite a bit of damage from Blade himself, and having Bone's on there would at least alleviate that somewhat.
Also, screw this boss against non-elation teams. I probably could've used an E1 Tribbie against it, but I wanted to see the all-male team in action. I would've tried King in Check or Knight 1, but they had the HP loss per turn, which shuts down this build, so I had to settle for Knight 2.