The Evasion overflow bug is a bug in the NES version of Final Fantasy II. If a character has a very high Agility stat and Shield level, and has a shield equipped, their Evasion stat may overflow, causing them to have very low evasion instead. This can be solved by simply removing the shield; it's likely the character will still have 99% Evasion without it and can opt to dual wield instead.

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