A War on Two >>An Undertale Story<<

All the hard work was wasted. Alphys had been working for so long on Asriel's artificial soul. She had finished it at last. Once she administered the soul to Flowey, the ghost like form of new Asriel appeared. Asriel, after speaking with Chara, managed to convince Alphys to make his sister an artificial soul as well. Chara played her part with such skill, with Asriel as her willing puppet.

Alphys soon enough finished the second soul. Poor Alphys. She never would've guessed what would happen when the two returned to the mortal realm.

Chara and Asriel have returned. Chara, without explanation, has attacked every Monster and Human on the surface. Both being without corporeal forms, Chara and Asriel are immune to all attacks. Both Monsters and Humans must band together to destroy the two immortal beings that will kill them all if this war is not won.