Knight of Mars (Warlord trait)

Once per battle, after rolling a D6 or a D3
when making an Advance roll, hit roll,
wound roll, damage roll, charge roll or
saving throw for this WARLORD, after
any re-rolls (if any) have been made, you
can change the result of one of those dice
to be a 6 (or, in the case of a D3, a 3).
While your army is Virtuous: once per
turn, instead of once per battle