Hysh requires the total focus of will and an absolute determination of mind to channel and bind it into a spell. It is the most difficult of all the fragmented colours of magic to bend to one's will. However, it is accordingly the most stable lore, if harnessed correctly.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
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Lore Attribute
Before a Wizard attempts to cast a spell from the Lore of Light, they may choose to take a Leadership test using their own Leadership value. If passed, they add +1 to the casting result. If failed, they instead suffer -1 to the casting result.