Isto é o que o mérito Iron Will é para.
Da V20:
Iron Will (3pt. Merit)
When you are determined and your mind is set, nothing can thwart you from your goals. Characters using Dementation, Dominate, or any other mind-altering magic, spell, or Thaumaturgy path against your character are at +3 difficulty.
Elder levels of powers like Dementation and Dominate may overwhelm even this resistance. Against Level Six powers, the expenditure of a Willpower point through Iron Will only raises the difficulty of the Discipline roll by two. Against Level Seven powers, the difficulty is increased by only one. Level Eight and higher powers cannot be resisted with Iron Will.
This Merit does not affect Presence or other powers dealing with the emotions. Characters will Willpower scores below 8 cannot take this Merit.
E da edição revisada (a edição do registro quando o jogo é feito):
IRON WILL (3-PT.MERIT)
When you are determined and your mind is set, nothing can thwart you from your goals. When you are affected by a Dominate power, you may spend a point of Willpower to shake off the effects. In addition, you receive three extra dice to resist the effects of any mind-altering magic, spell or Thaumaturgy path. This Merit does not affect Presence or other powers dealing with the emotions.