Lead exam boss

Skeleton giant.

Firstly, I’m rage posting since I used line cover, Lana died, and so now I’m crashed for the time being (already force restarted a little bit ago) but how the absolute hell do I defeat this guy. I’ve leveled to 20, currently halfway through getting all my gear to +5 (front line is all +5 iron gear - Gerulf, Lana, MC | back line is Emil, Adam, Debra +3 iron equivalent gear)

My strat so far is just sleeping all the ads, blinding the main boss and going ham with front line and Debra with skills while Emil constantly uses evasion on front/backline. If it ever gets to 3 lines of ads then I use Adam’s secret art to wipe the board besides the hob goblins and the big mouth abyss guy. Is there some strat I’m missing? I have been at it for the past week or so it feels like and I’m defaulting to begging lol

Just wanting some tips or tricks pls cause I just want to level so I can go past b1 on my second run

Tl;dr: I hate the skeleton giant please how do I kill him im crying