JRPG monsters that eat your save file are the best idea and worst idea
True to the spirit of the buggy JRPGs of ‘ol, where stumbling on a glitch could wreck your save file and obliterate 40 hours of effort, the JRPG Ar noSurge was planned to have an especially devious enemy that munched on and deleted your save file. This is coming from an interview with its dev in Fa