At tier II the staff becomes an attunement item.
A gift of Hath:
All damage you do while holding the staff adds a die (same as your martial arts die) of radiant damage.
Weapon, Rare
You have a +1 bonus to attack rolls and damage made with this weapon.
When you reach level 6, you receive a gift from Hath:
The staff has 6 charges. When you hit with a melee attack using it, you expend up to 2 of its charges. For each charge you expend, the target takes an extra 1d6 force damage. The staff regains all its charges daily at dawn.