Rod of Kepeleke is a Unique Quarterstaff (2H Bludgeoning) in Diablo IV Season 15 for Spiritborn. It comes from Duriel, King of Maggots - two guides (older listing); Astaroth (Escalating Nightmare) - one guide S15 loot table; Horadric Cube Amalgamation with Shard of Agony (Duriel trophy) - one guide.
Unique power
Your Core Skills are now additionally Basic Skills and free to cast, but deal up to 30% reduced damage based on their Vigor Cost. When cast at Maximum Vigor, your Core Skills consume all Vigor to return to full damage, cast at their largest Size, and become guaranteed Critical Strikes, with [1.00 - 1.20]% increased Critical Strike Damage for each point of Vigor spent this way.
Affixes
Weapon Damage (inherent)
+Skill Ranks to Core Skills
Where it drops
Duriel, King of Maggots - two guides (older listing)
Astaroth (Escalating Nightmare) - one guide S15 loot table
Horadric Cube Amalgamation with Shard of Agony (Duriel trophy) - one guide
Cube 'Upgrade Direct Item to Mythic' (Crafted tag) - used by one guide's Stinger/QV/ToD guides
Horadric Cube: Upgrade Common Quarterstaff to Unique (1x Enhanced Primordial Dust + 10x Primordial Dust)