It's probably a typo for "Force of Will:"
Force of Will (Ex): At 7th tier, you can exert your will to force events to unfold as you would like. As an immediate action, you can expend one use of mythic power to reroll a d20 roll you just made, or force any non-mythic creature to reroll a d20 roll it just made. You can use this ability after the results are revealed. Whoever rerolls a roll must take the result of the second roll, even if it is lower.