Evil thoughts

Exploration Stage: Greenhouse
From: Detective
Description: There's something I just can't figure out. Why did the killer attack Martha? Did he have a grudge against her, or was he a business rival? There are a lot of powerful and valuable artifacts in the Room of Doom, so it's possible that they were after them. Maybe some of them are missing. Let's find out!
Completed: I knew it! Isabelle said this is the soul catcher from the Room of Doom. I finally figured out the killer's motive. He was simply trying to commit thievery. He had knowledge of black magic and was trying to steal something related to it.