@golguin: I was happy the Abhorrent Beast was gone too....until he spawned again as the first random boss in the very next dungeon run. Quite a bit easier the second time around after you already know what to do though; managed to 1-shot him this time. He seems to like me as I had to face him a third time later on too.
I held off on beating the game for a while because I wanted to try to complete the chalice dungeons first, but after finally beating the Loran Darkbeast and moving on to yet another area that was identical to the last I just couldn't take it anymore and decided to fight the final boss. Was pretty relieved to find out your progress in these carries over and doesn't scale to NG+ though, now I can go back when I want and don't have to feel like all that time up to that point was wasted like I was worried it might be (I refused to look at a guide for anything until beating the game at least once so I didn't know this was the case until I'd already done it).