Source: Book of Spirits p139
This Numen is a more powerful version of Possession; if the roll is successful, the possession is permanent. Spend three Essence points and roll Power + Finesse in an extended and contested roll versus the victim’s Resolve + Composure + Supernatural Advantage; each roll represents one hour. If the spirit gains 50 successes between dusk and dawn, the spirit gains permanent control of the victim’s body. Use the victim’s available traits (except Willpower points, which are equal to the spirit’s current Willpower points) and dice pools for any action the spirit wishes to take. If the spirit fails to accumulate 50 successes within the required period of time, the attempt fails. If a possessed body is killed, the spirit is forced out and must possess another victim if it still wishes to act. Use of this Numen creates a Ridden, specifically a Spirit-Claimed (p. 180).
Source: Mage: the Awakening p321
This Numen is a more powerful version of Possession. If successful, the possession is permanent. Spend three Essence points and roll Power + Finesse in an extended and contested roll versus the victim’s Resolve + Composure. Each roll represents one hour. If the spirit gains 50 successes between dusk and dawn, it gains permanent control of the victim’s body. Use the victim’s available traits (except Willpower points, which are equal to the spirit’s current Willpower points) and dice pools for any action the spirit wishes to take. If the spirit fails to accumulate 50 successes within the required period of time, the attempt fails. If a possessed body is killed, the spirit is forced out and must possess another victim if it still wishes to act.