I wonder how ub got ulb's event. Ulb's event is sans gets many gen0c1de routes and gaster tells the past. Ub's event is player do good route and reset + do bad route again. Ubub is get betrayed 2 times, so ubulb is ub got insane times betrayed so ubulb can be ububub+++~ how is this possible.😮
Sans: kid. When you pulled us out of surface, I thought this is all over and behind us. But it was your lie right? Tricked us and killed us like nothing. Are we the bad guy to you? We treated you like friend, and you betrayed us like nothing. You know what? This battle will be the last time of our battle but only one person can walk it out alive and earn the win. So *sigh* let get this over with.
Short story of this au, Frisk/Player/Chara did a pacifist route and killed the monsters on the surface, Betrayer Sans than met Gaster, Gaster yapped about how to kill the human blah blah blah. And the end