You harden your fists with the strength of iron.
By spending 1 ki, your attack’s damage increases by one step on Table: Damage Progression.
Adept Fists of Iron
By spending 2 ki, your attack’s damage increases by two steps on Table: Damage Progression.
Master Fists of Iron
By spending 3 ki, your attack’s damage increases by three steps on Table: Damage Progression.
Grandmaster Fists of Iron
By spending 4 ki, your attack’s damage increases by four steps on Table: Damage Progression.