Are there only 3 forms for the Dragon boss? After noticing that it changed if you didn't beat it first try I locked the follower who gives you a free carp encounter so I could end up at depth 58 with 1/5 core health, and I bought/used it right before getting to that 3rd form, but after that point the Dragon stopped changing, and I'm wondering if that's just the stopping point or if adding a Carp encounter mid-final-battle broke part of the encounter.