The Accuracy underflow bug is a glitch in some versions of Final Fantasy XII. When a low level character with extremely low Magick attempts to use a status move on a target with very high Vitality, and the accuracy of the spell becomes less than zero, the accuracy will underflow to 100%, allowing certain status spells to always succeed.

This bug can be useful to trivialize many late-game boss fights by continuously exploiting their status vulnerabilities, such as infinitely confusing Daedalus, Tyrant and Pandaemonium, immobilizing Shemhazai, or putting Fenrir to sleep.

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