Fics like The Last Remaining Enemy is Fear

Classic tired of the repeating genocide route, it drained him to the point of isolating himself while unknowingly fueling Nightmare's power. After getting severly injured by Dreams arrows, Nightmare is forced to flee and find negative emotions to fuel his weakened state. That's when he stumble across Classic. After recovering he decided to snatch Classic as his forever power generator. Mutualistic symbiosis Classic emotions become a power generator for Nightmare and feels happy with the negative emotions getting vacuumed. Nightmare Vacuum the negative emotions to fuel his power. Update : hiatus (WRITER BLOCK)

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