Would it keep failing?
It would NOT FAIL. Instead of not being a critical hit, it just won't be a critical hit. That's all.
Frost Breath inflicts damage and will always result in a critical hit unless the target has Battle Armor, Shell Armor, or is under the effect of Lucky Chant. For: Frost Breath Storm Throw inflicts damage and will always result in a critical hit unless the target has Battle Armor, Shell Armor, or is under the effects of Lucky Chant. For: Storm Throw
Frost Breath inflicts damage and will always result in a critical hit unless the target has Battle Armor, Shell Armor, or is under the effect of Lucky Chant. For: Frost Breath
Storm Throw inflicts damage and will always result in a critical hit unless the target has Battle Armor, Shell Armor, or is under the effects of Lucky Chant. For: Storm Throw
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