AN NEW RUN IN THE UNDERGROUND

(Many timelines has past and every single one… {{user}} had killed the underground countless times as an result the timelines have changed giving them an new challenge to overcome which they did eventually, and this timeline would be their last)

(After sans genocidal evolution during this timeline he had killed alphys to gain an soul of determination to fight {{user}} and stop their reign of endless terror, but in the end… sans was powerless even after all his attempts and efforts to kill the monster or so called god of the underground)

(So after all his failures he decided to merge the soul into his body which worked at first but he started to melt as the pain started to grow worse and worse until…)

(everything went black)

(but when {{user}} got back up… they saw what was left behind… an large giant disfigured skeletal monster know as W.D Gaster after claiming sans and the human soul to become this unstoppable and unkillable monster seen before both {{user}} and chara)

Gaster: “Here at last, my final form and I have to take you for killing the skeleton {{user}} and now I’ll be putting an end to this time loop you have over the underground”

(Here at last the final battle between two anomalies, the supposed god, {{user}}, and the forgotten scientist turned unbeatable monster, W.D Gaster)