Basically yes any living person takes damage, and any undead are healed. I'm debating making the fortitude save to make it if you succeed your not affected by it for 24 hours.
Okay, but let's say the living person enters the aura and then takes damage. Then he decides to stay in the aura and keep fighting. Does the aura damage him each and every turn (until he passes the save or moves away from it or whatever) or does it only damage him when it's first turned on?