I'm not entirely sure I've died every time.
However there is a counter of 10% off of the health total by 3 second interval. There minus the mana gauge in integral unit 1 deviating 6 points per 10 seconds.
Preceded by a status effect, and then they'll turn bright red. Followed by everyone turning heather red bright orange. And then as we all know frames of insta -kill. Some what indigo beasts!!
Signed,
Gerald