Hand of Apotheosis is a Unique Gloves in Diablo IV Season 15. It comes from Bartuc (Lair Boss loot table); Bartuc (Lair Boss loot table, boosted class-unique drop).
Unique power
Any Demonform grants you all Metamorphosis Upgrades for free, and they are [50 - 100]%[+] more potent.
Affixes
Willpower
Maximum Life
Where it drops
Bartuc (Lair Boss loot table)
Bartuc (Lair Boss loot table, boosted class-unique drop)