What is a 'fatal error' in the context of Undertale's Underverse?

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What is a 'fatal error' in the context of Undertale's Underverse?
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A 'fatal error' in Undertale's Underverse refers to a critical, unrecoverable glitch or inconsistency within the game's code or timeline that leads to a complete system crash or, in the narrative, a permanent cessation of the affected timeline or character's existence. These errors are often caused by severe paradoxes, timeline corruption, or attempts to break the established rules of the Undertale universe.