Pactmaker (resists) and Platemail let me tank a hit from the zombie boss. CYDSTEPP let me tank a second. The real issue would have been that Bear Mace deals twice as much damage to Boss 1 as it does to Boss 2, but thanks to PISORF also spawning, there was no trouble killing one boss and leaving the second at 1HP for an easy finish. Refreshment let me convert CYDSTEPP when I was ready to go for the damage spike after the corrosion phase was done.
Balanced Dagger was nice, but probably not even necessary. Since only Warlords can really multi-cast CYDSTEPP anyway, Mystera was more of a piety farm for Pactmaker than something I actually made good use of. But no complaints there - I had spare piety from Agnostic's Collar anyway.
If not for Balanced Dagger, Blackspace might've been tight, and I might've needed to buy Spoon or use potions. As it was, it was oddly easygoing for a Rat run. Sensation Stone and open space to knock back the troll made it effortless to get the corrosion CP going.