Sans the Stab Stick

Plot
Kaela is bored, so she decides to download and play a pirated copy of Undertale. She manages to speedrun it faster than Dream’s luckiest speedrun. She finally reaches Sans, but it is then revealed that Sans is actually Sans the Stab Stick, one of Alex’s swords that came to life. She gets absorbed into the game and fights Sans the Stab Stick for a while. As it turns out, her powers of Pure Luck only partially work inside the game, so she ends up getting multiple stab wounds. Kaela almost dies before getting out of the game. She miraculously doesn’t die from blood loss and gets discovered by Moxie, who heals her. Kaela successfully avoids getting caught by the FBI and runs to school. Sans the Stab Stick escapes from the game and flies over to Alex’s house to pretend to be her sword so he can stab more people.

Trivia

 * Kaela is canonly better than Dream.
 * Sans kills Alex's sword, who is also alive.