Volistad is taken aback by the massive surge of sensory overload as he tries to decipher the mythal's properties. Tfhe only thing he could sense was an overwhelming degree of Abjuration energy (in terms of spheres, it would be a blend of Protection and Fate). His pupils constrict to near pinheads,

Spoiler: Effects on Volistad
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He is both dazzled and dazed for (3d4)[7] rounds.
It would feel like staring directly at the sun, while standing 20 ft away from its surface.