Razorplate is a Unique Chest Armor in Diablo IV Season 15 for All classes. It drops from Duriel, King of Maggots.
Unique power
Thorns has a 30% chance to deal [200 - 250]%[x] increased damage.
Affixes
+[1,811 - 2,491] Thorns (1,811-2,491)
+[1,811 - 2,491] Thorns (1,811-2,491)
+[1,811 - 2,491] Thorns (1,811-2,491)
+[1,811 - 2,491] Thorns (1,811-2,491)
Where it drops
Duriel, King of Maggots (Greater Lair Boss, 1x Greater Lair Key) - dedicated multi-class Unique
General Unique Pool - every Lair Boss (Initiate, Greater, Exalted, Belial) can drop it in addition to their dedicated table (one guide's Boss Loot Table Cheat Sheet)