Whiter the Cherubim

A heavenly entity that watches all directions, never turns, banishes evil to the Nether where they deserve to be and avoids violence unless you bring it down to 50% health when it enters nether itself and punishes the sinners with the Smites of Heaven and Fire of Hell A presence so Divine that it turns flowers into Healing Roses
Upon Death it's Heavenly Flesh Sprouts Healing Flowers all Around You
If attacked will banish you to Nether use Enderpearls to Save yourself before the Banish Executes

Whiter Spawning Structure

I got the Idea after this meme