Holy crap, I can finally auto-battle this stupid boss on the main account (and the f2p challenge gang can borrow Aventurine too while their own is building, wheee!). Gambler-kun broke this buzzy noise wide open, using the build I posted earlier; his meta defense build would be fine too. Ultimate crit pictured is his best so far (as I compose this and watch him in support mode on f2p he just did 51k lmao), he mostly got about 28k and the big hit was while bug-butt was debuffed pretty hard. Aventurine’s follow-up damage shown is about average for this build; it really is inconsistent in general and I’ve seen it do less than that on a full screen of enemies, and more than that on one or two enemies.
Consumable item buffs are physical damage bonus (Enhancement Paste: Physical) and effect resistance (Jade Marrow Diffusion). Depending on their individual builds, each character’s effect resistance is either close to or past 100% with Aventurine’s shield plus that consumable. I used Aventurine’s technique before the battle as well. Hanya buffs Clara so Aventurine’s damage is all his own.
Oh, and I forgot to item-buff the f2p gang before one run and they still did okay. Omnomnom, Gold-mon go bom.