Balazan's Maxtlatl is a Unique Pants in Diablo IV Season 15 for Spiritborn. It comes from Echo of Varshan (Malignant Burrow, Hawezar); Horadric Cube: Upgrade Common Pants to Unique.
Unique power
Your Casts damage Close enemies for [125 - 150]% of your Thorns and also deals 100% of this damage as Poisoning over 3 seconds. Each time you've retaliated with Thorns, for 5 seconds the Poisoning damage is increased by 100%, up to 300%.