Protean Heart is a Unique Amulet in Diablo IV Season 15 for Spiritborn. It comes from Horadric Cube: Upgrade Common Amulet to Unique; Harbinger of Hatred (Harbinger's Den, Nahantu) - one guide S15 / another guide / a third guide (Abhorrent Heart trophies).
The Base Spirit of a Skill cast grants: Eagle: [17 - 20]% Movement Speed. Gorilla: [17 - 20]% Damage Reduction. Jaguar: [17 - 20]% Attack Speed. Centipede: [1.7 - 2.0]% Life per Second. Casting a Skill of a different Base Spirit: Swaps to the new bonus, Increases Core Stats by +100% for 7 seconds.
| Slot | Amulet |
|---|---|
| Item type | Amulet |
| Rarity | Unique |
| Classes | Spiritborn |