Yeah, the video helps. You definitely don't want to be wasting Arcane Poultices on OP!
I certainly don't Robert lol
I took a rest for a few days and caught up with Uru, and then I went back to the save just before I took on OP, and this time because I knew about how the tongue worked I beat him easily

I only use 4 items

Oh and in beast form I decided to eat those drated squid, I got sick of them, and it's kind of cool being able to squirt their own ink back at them lol