Previously: Frisk, Flowey, Deos has to deal with Muffet, a spider-like monster who tried to kill them (due to something Flowey did before his deal with Deos) who was dealt with peacefully and then Mettaton went transvestite in a stage performance as he dropped them down into the "dungeon". Meanwhile, Cali and Dr. Alphys are planning something involving Undyne without telling anyone else.
(Hotland)
They all fell to the "dungeon", where ahead of them, across a bridge, is what they encountered in Snowdin on a much larger scale, where each did a different thing, Deos knows the exact layout and has worked out the route that they need to go to navigate through it safely. "Just follow me and we'll get through it." Said Deos, quietly to Frisk, Frisk nodded as Mettaton flew down.
"OH NO! WHATEVER SHALL I DO?" Mettaton said, badly acted "MY LOVE AND THEIR GUARDS HAVE BEEN CAST INTO THE DUNGEON."
"The joke is on you, we're getting out." Deos said, Mettaton was barely able to contain his fury.
"YOU WILL ALL SURELY PERISH FROM A PUZZLE SO DASTERDLY! O, HEAVENS HAVE MERCY! THE HORRIBLE COLORED TILE MAZE!" Mettaton said.
"We know how this works, Mettaton! There is skeletal sentry of Snowdin who favors pasta who has explained how this works, green summons a monster to fight, does it not?" Deos said, in a dramatic tone, Mettaton does not like to be overshadowed.
"GREAT...THEN I WON'T WASTE YOUR TIME REPEATING THEM!" Mettaton said, eager to get on with this...they then proceeded to navigate the maze.
"I was wondering what the fire behind us was for..." Deos said.
"YOU HAVE 30 SECONDS TO GET THROUGH OR IT'LL INCNERATE YOU! GOOD LUCK, DARLING!" Mettaton said, barely able to contain his rage.
(Deos' Apartment / Lab)
Cali is disturbed by what Dr. Alphys has told her about the stage performance "The tile puzzle isn't what I'm disturbed by, nor that Deos is a good singer...that's actually quite surprising actually, it's Mettaton...in a DRESS! Does he have no dignity?!" Cali said.
"Well, I didn't force him to wear it, are there some humans that do that?..." Dr. Alphys asked
"A few, yeah, I just let them go wherever they're going, it's not my business, so...how's it goin' with that device?" Cali asked.
"It's g-going well, I call it the D-T Regulator, something that will allow Undyne to use Determination without it causing her to m-melt, t-there's just the problem of how I can be sure that it works..."
"How what works?!" Undyne said as she burst into the Lab, surprising Dr. Alphys...
(Hotland)
"Are you still here, Mettaton? it's over." Deos said
"DARLING, WHAT ARE YOU TALKING ABOUT...?" Mettaton said, ominously "DID YOU FORGET WHAT THE GREEN TILES DO? THEY MAKE A SOUND, THEN YOU HAVE TO FIGHT A MONSTER."
"I'm guessing that's you..." Flowey said, unemotionally.
"THAT'S RIGHT!" Mettaton said, as he stood in the way of them.
"Yellow button, Frisk" Deos said, which gave Frisk's soul the ability to shoot bullets from their soul when yellow, then came some hammy acting from Mettaton.
"OOOH! OOOOOOOH! YOU'VE DEFEATED ME! HOW CAN THIS BE, YOU WERE STRONGER THAN I THOUGHT..." Mettaton said as he quickly wheeled away ahead of them, he was silent upon then catching up to him.
"DR. ALPHYS TOLD ME THAT YOU NEEDED AN OFF-CAMERA MOMENT WITH ME, SHE TOLD ME WHO AND WHAT YOU ARE, DEOS, I SEE YOU AS SOMEONE WHO RUINED MY SHOW..." Mettaton said, with some anger.
"I see it as rewriting the script, which is why I'm here in the underground in the first place, I've seen what would've happened, if I wasn't here. Frisk here would've headed for the CORE alone and you'd do all that you could to stop them, ending with a live dance-off...there is another way and I can probably make it up to you with something that I can see generally raised the spirits of the Underground." Deos said.
"I'M LISTENING..." Mettaton said, intrigued.
Deos said "All I'm asking from you is to keep this to yourself until nearer the time, there is some off-camera stuff that I have with Asgore, NON-LETHAL off-camera stuff, once we're ready, it will no longer matter either way if everyone does know what I'm hiding."
"WHAT HAVE YOU GOT FOR ME?" Mettaton said, he's interested.
Deos looked at thin-air from Mettaton's perspective "You can come out now."
Then Toriel appeared out of thin air, Mettaton was NOT expecting this "QUEEN TORIEL, WHERE HAVE YOU BEEN HIDING ALL THIS TIME? IF THIS IS A PITCH FOR A TALK SHOW, I'D HAVE CALLED THE REST OF MY SCHEDULE FOR THIS!" Mettaton said, enthusiastically.
"Firstly, please do not refer to me as Queen! Secondly, how did you know who I was?" Toriel said, slightly annoyed to begin with.
"IT'S OBVIOUS WHAT A BOSS MONSTER LOOKS LIKE AND YOU HAVE BEEN GONE FOR..." Mettaton answered
"Long enough for your cousin to notice her absence...I have a number of things planned for you, the first will involve you showing a reunion between Asgore and Toriel, which is LONG overdue, the second will involve Flowey" Deos explained, while briefly pointing at Flowey "I want to keep the details of that part to myself for now, I want to surprise everyone."
"AT LEAST I KNOW THAT YOU WON'T BE JOKING AROUND WITH THAT ONE." Mettaton said.
"That's more Sans' thing...the third won't be a joke to me either, it involves you getting some modifications, it'll be useful for when we're about to deal with something worse than any human by themselves can be." Deos said, unnerving everyone, even Flowey "Dr. Alphys will be able to do them, I'd check on her first before you head to the Capital...oh, you'll need to know your cue for your entrance, come in when I say 'now for the rest of this to come together'".
"I CAN WORK WITH THAT AND THERE'S EVEN AN EXPLOSIVE FINALE AT THE END, THE RATINGS WILL GO THROUGH THE ROOF!" Mettaton is excited.
"Yes and it'll prove that humans and monsters can work together, perhaps after we're done, I can go over your ideas for shows and help you to avoid any negative backlash, due to the content rather than the one hosting it." Deos said.
"OHHHHH YEAHHHH! YOU GET INTO POSITION DARLINGS AND I'LL BE READY FOR MY PART!" Mettaton said as he rocketed away, presumably to the Lab in Hotland.
"What would have happened if it was just Frisk?" Toriel asked
"When we get to the CORE, he would've made it harder for us to navigate through it, then it would end with a dance-off and that's the best case scenario, at worst, it'll involve a flashy but useless form that would've made things harder for what was taking over Frisk, if Dr. Alphys had time to refine it...We should have a more direct route through the CORE from this point onwards."
"Understood...I had best go in the Dimensional Pocket Amulet now." Toriel said
"This should be for the last time, once we get to New Home, you'll no longer need to hide" Deos said.
They then walked up to the entrance to MTT Resort and found the Nice Cream Vendor and the two Royal Guards, they all seem happy, the Nice Cream Vendor due to sales of Nice Cream picking up and the two Royal Guards, now that they're more honest with their feelings towards each other.
"I take it business greatly improved since you moved here?" Deos asked
"Yeah, it's so good that I've sold out, sorry if you came here disappointed." said the Nice Cream Vendor
"Not at all, at least you know now that cold things sell better in warm places" Deos said.
"Those two look happy, don't they?" asked the Nice Cream Vendor
"Yes, I have some business in MTT Resort, so I'll leave those two alone and you might want to consider restocking on Nice Cream in the meantime" Deos said.
"Will do!" said the Nice Cream Vendor as Frisk, Flowey, Deos and Toriel (in her astral form) climbed up the stairs...
(MTT Resort)
The brightly lit exterior of MTT Resort beckons them and in front of them is Sans, he knew that they would get there eventually.
"Yeah, I knew that you'd be there, excuse me, I have a couple of items to get around the back" Deos said, as he went around the back of MTT Resort.
"What do you think he is getting?" Toriel asked, in her astral form.
"You got me... back that way is a shop run by Bratty and Catty, those two girls are friendly and more than a little air-headed, but I can talk, am I right?" Sans said.
"Did you know who I was the moment that you saw me?" Toriel asked.
"Yeah, I've goat to be blind to miss that." Sans said, making Toriel laugh.
It was at that point that Deos returned to them with a Toy Gun and a Cowboy Hat, all but Sans knew what this meant, Flowey was the most annoyed, then Deos held the items tightly. "Now to find out what happened to the last one..."
"Last what?" Sans asked in confusion.
"The last of the humans that have already been killed, we already know that Asgore has not killed them personally, Deos has some psychometry ability that allows him to find out how they died...as well as finding a little about how Frisk fell down, it was too much for him to handle." Toriel replied.
"Right...here goes..." Deos said, as he started to see what happened to the last human child killed in the underground...
How was the Yellow Soul child killed? How will the reunion between Asgore and Toriel go? How does Deos intend to fulfil his side of the bargain and what are the two nerds working on? Find out in Chapter 26: CORE of the Problem.