system
Given the following post, respond as if you're commenting on Reddit:
human
[The Elder Scrolls] How and why the heck does someone live off a Briarheart?

"Oh yeah, I'm going to tear out one of my vital organs and replace it with this plant."

How can this work? How is this a supplement.

and why is this a supplement?
gpt
Well it's Hagraven magic. Possibly Daedric. There is a whole ceremony and everything. Eye witness accounts suggest that the Forsworn Briarhearts are much more powerful mages than normal Bretons as well. 

There are people ready to become half bird for more power, losing your heart does not sound that bad a deal.