So Kei's appeared to keep Aris going. I don't know what mechanic this translates from in BOTW/TOTK, so I'd appreciate a explanation. It's still kind of cool to have Kei be a guiding hand for Aris.
"A restorative power born from the spirit of the Champion Mipha. When your hearts run out, you'll automatically be resurrected with full health plus temporary bonus hearts." — In-Game Description