orechi seems like trash. only seem to get his unstable version or mix version. both suck.
secret ingrediant/mix seems like even worse shit here, as its RNG on targeting friend/foe.
Same with the firestarter starters.. 1 damage/2 pyregel..
can manipulate this a bit. put orichi in top, and leave bottom row empty. so, only allies up top a first, and only enemies at bottom. then rely on spells all around. again, can control the targeting a bit with good choices... spell cost rng is rough. but, favors 2 and 3 cost spells, as they might come in at 1 or 0.
still doing horrible.
best run, was a pure rng on a hothead. the one that does aoe ability attack based on its attack. it came with multistrike. and I gave it that growth equipment.. so it ws doing like 100x2, and 1 aoe on ability. but it wasn't enough to actually solo it all.
no idea how to make orechis unstable line viable. it doesnt stack fast enough to do anything? AND you need extra sources of reanimate, else it will run out when he hit by attacks.
..best atm.
orechi solo top floor. solo here means I can drop forevermore serum, etc and only hit him. intrinsic/doublestack..
reanimationlab for top floor. 7/7 on reanimate.
hothead,gold tooth, snotty whelp middle. rng on tome of contracts. although, solo hothead for tome and 1 turn cd might be key.
stack infusions in hand. dont use till boss appears.
failed on cherub again.. orechi died before cherub even got to him again. just no idea how to make this dude work I guess.
this one had some real value. holdover double stack dragons breath, and acid rain..
edit

k. I think maybe I got an idea how to make him work.
the incant version at least. bottom row. spam the mixes. dont need to cast the infusions. just stack them up till is clear to cast on ally or enemy.