A battle breaks out between Sans and Gaster, with the former being able to destroy all of the latter's Chromatic Magic hands, weakening Gaster. However, Frisk's SOUL refuses to be taken, so it breaks from Gaster's clutches and flies into Sans's hand, getting stronger with Determination. When Frisk attempts to give Sans his SOUL, Gaster intercepts and takes both Frisk and his SOUL with dark matter. Sans knows that he cannot defeat Gaster, but he decides to use Frisk's SOUL again to power up. Once Gaster exits the Void, he returns to his original form, regaining his powers. Sans arrives in the Void to save Frisk's life, but he cannot teleport out due to the Void's nature, so he uses a Gaster Blaster to destroy the door, allowing them to escape. Gaster covers the Reset button with a dark matter and begins attacking Frisk. Back in the Void, Frisk is trapped inside as Gaster explains that he has been watching him, saying he wants to obtain Frisk's SOUL of Determination to return to Frisk's home dimension and become whole again. At Grillby's, Sans realizes that Frisk is not there. Out of curiosity, Frisk opens the door and enters the Void, where a decaying and living Gaster sits. They are delighted to see each other, and Sans prepares to go to the next area to teleport to Grillby's with Frisk, but the child ends up in a hallway that has not appeared before and has a mysterious grey door. Meanwhile, Frisk approaches Sans at his sentry station in Waterfall. Gaster is fascinated, feeling as if this new timeline is strange, so he believes he has a chance to enact his plan. He then attempts to take Frisk's soul, forcing Frisk and Sans to fight back against him.Īfter Sans obtains Frisk's SOUL and resets the timeline, W. When Frisk enters Waterfall in Hard Mode and meets with Sans, the glitched state of the timeline allows Gaster to will himself back into existence.

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