Wondrous Item, artifact (requires attunement by a Expend three ki points over the course of an hour while practicing with the gloves equipped.)
These well-worn fingerless cloth gloves have brass ridges over the knuckles.
In addition to acting as brass knuckles, The user can spend a point of ki and slam the ground, creating a five foot radius crater around him and splintering the earth another ten feet out. Any creature inside the area created must make a dexterity saving throw (dc 11+wis mod) or take damage equal to the slam, including any magical effects bestowed upon it.
Notes: Expend three ki points over the course of an hour while practicing with the gloves equipped.
There is no specification on amount of damage dealt. What is the damage dice for the slam?