Gauntlets of Sheol is a Unique Gloves in Diablo IV Season 15. It comes from Duriel (Lair Boss loot table); Duriel (Lair Boss loot table, boosted class-unique drop).
Unique power
While Fiend of Abaddon is alive, you periodically sacrifice all other Archfiend Summons, dealing Fiend of Abaddon's damage around them and increasing Fiend of Abaddon's damage by [40 - 50]%[x] per demon killed, up to [600 - 750]%[x] for 60 seconds.
Affixes
Willpower
Critical Strike Chance
Where it drops
Duriel (Lair Boss loot table)
Duriel (Lair Boss loot table, boosted class-unique drop)