Well, it is too late for me to kill Riliane at the beginning, but I got her to attack me by killing Lilly, and she went down. Gotta say, is it me, or does Celeste gain natural regen after sucking Riliane's soul? I'm pretty sure she's recovering HP every turn, even when I don't use Vampiric Strike, and when I use it, recovers more than what it says in the numbers. <.<
Interesting. There are so many different options and outcomes on the evil playthrough when it comes to Riliane that can easily elude you if you decide that the best option is to kill her right away. I didn't know about getting the healing spell for the slimes if you sacrifice her either.
Is it just me or you get way more freedom if you're evil? On the 0 corruption playthrough you're basically railroaded into doing things the only possible "right" way.