Depends on your definition of need. [She's trying not to chuckle at that look Hibiki is giving her. She really is.] I won't die if I don't, and I won't go crazy. Loki put runes onto my spine, under the skin. They burn off the hormones that set me off. It happens about once every lunar cycle, when they've built up enough to cause a problem.

But... it's still an instinct. My body still craves it, and if I do that more often, the pain's less when it burns things off since there's less there to burn.

So, not need... but I definitely have an urge.