After finding out where Wisteria resides Gaster packed all of his valuables and leaves his room he then uses his magic to seal his room so that Papyrus won't be able to enter his room before he could leave the house he proceed to Papyrus' room to check if his eldest son is doing fine; upon entering he saw Papyrus laying on his bed breathing heavily.
Gaster went inside and saw that the poison is spreading he then open his bag and grab an elixir he then pour it on Papyrus' mouth then suddenly he saw Papyrus is started to waking up he then put the elixir on Papyrus' desk along the ingredients on how to make it, before he could leave he says his final words on Papyrus "I left you some ingredients on how to make the elixir to slow the process of the magic poison.... Your brother left in here incase someone is in danger.... It's not going to remove the poison it will help slow the poisoning process till then farewell Papyrus..." After saying his final words Gaster left the house and Papyrus was in tears to know that Wisteria left something for him to slow the magic poison that spread on his body.
After Gaster left his home in Snowdin Town he walked to to the forest all the way to the entrance of the ruins; upon seeing the entrance he uses his magic to open the door and he immediately went inside and started closing the door so that no one could see him enter. When he arrive he met Toriel and offer him to stay in a guest room to rest and Gaster agrees with her. Gaster explained to Toriel the reason why he's in the ruins and Toriel was in deep shocked to hear that the monsters outside the ruins are completely changing overtime she joins Gaster with his search to find Wisteria and the two of them continued searching asking some of the residence in the ruins to find more clues on his whereabouts.
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Meanwhile in Wisteria he was been chased by the murder time trio named Horror, Dust, and Killer, he accidentally opened a portal in a wrong Au and the trio saw him and try killing Wisteria but he fly as fast as he can to avoid them. "HEY COME BACK HERE WE'RE NOT FINISHED YET!!!??" shouted Killer while using his Gaster Blasters to shoot at Wisteria but it completely missed "S-STAY AWAY FROM ME I DON'T WANT TO GET INVOLVED OF WHAT YOU THREE ARE DOING?!?!?!"
The trio was completely annoyed and started to used there magic attacks together in other to finished him; Wisteria noticed the attack and started using his protection magic to defend himself. Until he shouted at them while sobbing "Y-YOU L-LEAVE ME NO CHOICE.... I-I-I'LL USED MY ATTACK ON THE THREE OF YOU TOGETHER!!???" Wisteria then stops when he sees both Dust, Killer and Horror's Gaster Blasters shoots toward him, he then uses his spear to absorb the blast which shocked the trio more; after Wisteria absorbs it he then fires back the blast that his spear absorb towards the murder trio.
Both Horror, Dust and Killer saw the attack coming towards them and uses there bone magic to defend but the blast is too powerful and breaks the bone magic that shielded the trio, the three of them were shocked and it was too late for them to teleport away "W-WHAT ARE WE GOING TO DO NOW OUR BONE ATTACKS ARE NO MATCH FROM HIS ATTACK!!!???" Horror screamed.
The Murder time trio saw the blast is getting closer towards them until the blast shoot directly towards the snow near them creating a huge mist around them, when the mist was cleared Wisteria was already gone and Killer stomped his shoes on the snow angrily "DAMN IT THAT ATTACK WAS JUST A DISTRACTION TO US SO HE COULD ESCAPE!!!!" said Killer in frustration.
Horror sighed and pats Killer's shoulder "Don't worry Killer we will find him later right now we have to go back!" Killer calms down and nods in agreement, meanwhile Dust looks at the snow wondering the events 'How does this Sans manage to deflect our gaster blaster attacks and used it against us?' Both the murder trio teleports away from the Au and decided to stay silent to the events that their mission failed due a Sans escapes and attack them alone.
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In WisteriaTale Ruins, Gaster follows a light orb that he found in Toriel's home Toriel understands that Gaster will leave in her place to follow the light orb that kept on following him, Toriel gave Gaster some parting gift to remind him to push forward and Gaster accepts her gift and says his last goodbye on Toriel.
Gaster was now on the location were the light orb leads him and what he saw it was a dead end and said in confusion "Why did you take me here it was a dead end?" not long after Gaster saw a portal opening he quickly hides and what shocked him the most that the monster who jumps out of the portal was non other that his son Wisteria!Sans. He quickly teared up to see him until he noticed that his son was shaking badly.
Wisteria panted and shaking after the unexpected encountered to the murder time trio he limps and started to touched the all and used his magic to open the entrance to the Jewel Forest, once he was about to enter he suddenly fell down on the floor breathing heavily. When Gaster noticed it he quickly goes out of hiding and ran towards Wisteria holding him. Gaster checks Wisteria until he noticed that Wisteria uses too much of his magic; Gaster uses his magic to share some of his to Wisteria.
Wisteria opened his eyes and what he saw is his father's face focusing his sharing magic to him, Wisteria teared up and touched Gaster's face and said "D-Dad i-is it.... r-really you...?" Gaster held his son's hand and said "Yes Sans its me you don't need to worry anymore!". Wisteria smiled happily while tearing up and attempting to hug Gaster but he couldn't move his body due to exhaustion; Gaster noticed it and hugs his son happily.
"Don't worry son I'm right here now, we will talk later but for now you need to rest!". Wisteria smiled and nodded his head as he agreed then he immediately falls asleep, Gaster holds Wisteria's body gently and stood up, he noticed that the light orb was waiting for him and went inside the portal. Gaster follows the light orb while carrying Wisteria.
Gaster noticed that Wisteria was sleeping peacefully and said "Rest well Sans!" he went inside the portal to the Jewel Forest and portal located in the ruins completely disappear.

YOU ARE READING
WisteriaTale
FanfictionThis Au start with a skeleton who has a special hidden magic that no other monsters in his Au have ever seen he named himself as "Sans" but in other sanses from the different Au calls him "Wisteria" Wisteria is the only monster that has special hidd...