Dragons are not blinded because it is a second-level spell. All dragons are immune to it, except for some neutral ones.
As for the cows with "chance"... basically, all chances are random. :D But a stack of cows above 50 always applies Deadly Gaze. The damage varies, but there is always an exaggerated amount of damage. That's why angels sometimes appear in the Swamp earlier than in the Castle. :D
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