What does "immune to errors" mean?

What does "immune to errors" mean? - Close-Up Shot of Scrabble Tiles on a White Surface

After leveling up the Robot, I was offered a Buster Sword as a reward. The Buster Sword's description states "Do ☐ damage, immune to errors".

What does "immune to errors" mean?

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What does "immune to errors" mean? - Close-Up Shot of Scrabble Tiles on a White Surface
What does "immune to errors" mean? - Close-Up Shot of Scrabble Tiles on a White Surface
What does "immune to errors" mean? - Close-Up Shot of Scrabble Tiles on a White Surface





Roll the Dice, Hit the JACKPOT! - Dicey Dungeons




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