Sans told you about the Alternative Universes he visited and everything he got to know about Cross He described in detail the confrontation which caused the destruction if the Multiverse. An ominous man who brought him back home... A power more dangerous than reset? Before Sans left, he said this “if you’re looking for more answers, you'll have to ask him yourself”. After a while in a moment in your thoughts, he appeared right in front of you.

“Good, You are already aware of it. Sans is undoubtedly an excellent messenger. Pleasure to meet you, human. You can call me XGASTER”

"Your timeline became very special after that incident. Let me tell you, no one else in the multiverse can understand - how valuable this place and your fascinating traits are. I have come... to taste your true power, player."

"All your questions will finally be answered. I fervently wish for you to come with me." XGaster said with a deceiving smile, this is not his true intentions