If a magus has this Virtue, then whenever he is about to lose Fatigue from casting a spell, he loses 1 less Fatigue level than normal, with a minimum of 1 Fatigue level — but if the spell would have been cast without Fatigue loss, then he still loses no Fatigue.
A magus may take the Virtue more than once, and withstand 1 Fatigue level for each level of the Virtue, although the minimum Fatigue loss remains. If he has Withstand Casting (3), he may withstand up to 3 Fatigue levels lost, with a minimum of 1 level lost.
The Virtue decreases the severity of the Fatigue lost in the exact manner of the existing Fatigue loss. Thus, if the magus casts a Formulaic spell, the Fatigue is short-term Fatigue, easily recovered, and if he runs out of Fatigue levels he is rendered unconscious, loss of extra Fatigue levels results in him being unconscious for one hour for each overflowing level, and the respite of Withstand Casting lessens this. If, on the other hand, he casts a Ritual spell, then the Fatigue is long-term Fatigue, and losing more Fatigue than he has remaining causes wounds — the respite of Withstand Casting reduces the severity of wounds, and this may result in him taking no wounds (with the minimum Fatigue lost rendering him unconscious).
You may not start your character with both Vulnerable Casting and Withstand Casting. However, she may acquire both in the course of play (Withstand Casting from Initiation rituals or beneficial Twilight effects; Vulnerable Casting from Ordeals or bad Twilight effects). If this occurs, apply the extra loss from Vulnerability first, then withstand the increased loss.
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