Why is Nutrient Blood so powerful?

I’d like to understand the math behind Nutrient Blood + Mend + Everglow giving massive overheals. Combined with Divine Strength, my characters now receive strength and intelligence buffs by the thousands, and then one shot most enemies. Older screenshot attached, shows one of my characters getting 50,000+ healing from Nutrient Blood.

I was wondering the same thing. It’s great when it works for your team, but I’m fighting Hemlock Ents (with no Mend on their side) that fully heal everyone, and when I take 30k Blight damage, things get a little dicey.