Heart is a freaky aspect tbh, there's so many ways powers based entirely around souls and sense of self could be used for messed-up shit. Imagine a Witch brainwashing someone by manipulating their soul, or a Thief or Rogue stealing part of your personality, or a Prince just deadass ripping it out and destroying it.

Yep, I mean we see Dirk literally doing exactly that to Aranea, except it was Brain Ghost Dirk and he was juuuust slightly short of ripping Aranea’s Soul out. It wasn’t pretty to watch.