Yeah that's probably Rose Petal, now that I noticed the horned shadow in the last panel. Maybe it's not a ritual but it has something demonic involved, so do I get partial credit for my previous guess?
Silly Willow, Rose Petal can make you do anything! I've never heard Rose Petal speak that loud before. I was not expecting this, especially out of Rose Petal. In case, you hadn't guessed, i'm pretty sure it's Rose Petal in that doorway.