Summary of the Secondary Unique Effect:
At max Vigor, the Rod of Kepeleke transforms your Spiritborn’s Core Skills into some of Diablo 4 Items the most powerful abilities in your arsenal:

Full damage restoration.
Larger area of effect.
Guaranteed Critical Strikes.
Additional Critical Strike Damage based on Vigor spent.
This secondary effect makes the staff incredibly potent when managing Vigor efficiently, giving players a way to buy Diablo IV Items deal massive damage while ensuring they can maximize their abilities’ effectiveness.