Guardians Tale(An Undertale X ROTG Story)
Sans knows that Frisk had RESET. What he wasn't expecting, however, is for the whole timeline to go back to the beginning, after the children of the King and Queen died. This timeline, however, goes a little...differently, than expected.
For instance, he had gotten to meet Toriel long before he should have known who she really was, and now helps her out when he can. Alphys had come clean with The Amalgamates only a few days after they were accidentally created, and everyone in The Underground knows of the True Lab, and the supposed "secret experiments" that happened within it.
The rest of the timeline goes as normal.
The six humans after Chara fall down and are killed, like all of the previous times.
But, instead of Frisk being the eighth, he finds a twelve year old girl named Lillian Bartlett. Her SOUL is like nothing he has ever seen before, and he suspects it to be much more powerful than even DETERMINATION.
But, unknown to Sans, a villain that comes close to being as powerful as Chara soon enters the scene, and he accidentally uncovers the secrets and old friends hidden away in Lillian's past.
Can The Guardians, with some help of a group of monsters, SAVE Lillian from the clutches of a demonic ghost and The Nightmare King? Or shall she be lost to the power of LOVE and Darkness?