The Primordials cursed the Lunars to be like the animals they became. As a Lunar ages and their Essence grows so does the taint within it. Luna blessed each one of her champions with a spirit shape. As the Lunar's Essence grows more powerful their spirit shape starts to manifest and grows more noticable as they get older. Like the Solars they gain Limit. When this reaches crisis point the Lunar becomes overwhelmed by animal instinct and degenerates into a feral state. As they get older their tell becomes more pronounced and merges with their human form until there's not much left of them that is themselves. Lunars believe this was a particularly cruel curse deliberately placed on them by the Primordials since they are individualists.
   when their Limit reaches 10 roll their Limit against a difficulty of their own Essence. Repeat this roll every action. For every roll made reduce their Limit by one. 10's count as two successes as usual. As long as the number of successes is equal or greater than their Essence they're fine. If the roll fails then the Lunar's mind is overcome by animal instincts and they enter Limit Break. The savage power of their primal urges gives them increadible willpower, adding a number of temporary points equal to their Primary Virtue even if it takes their total above ten. They spend a number of scenes/minnutes in this condition equal to their Limit when they failed their Essence roll. Lunars may attempt to dull the effect and manage to exert partial control. To do so they must spend a willpower point at the beginning of every hour and Limit Break lasts hours not scenes, until they've spent a number of points equal to their Primary Virtue. Once they have they have successfully asserted Partial Control athough will still continue until all the time is spent. Attempting to assert total control may result in another Limit
Break roll or degenerate into complete animalism if the Storyteller thinks fit.