The immense dense black fog of the fountain instantly disappear to the black-hole like suction of the star imprint. The 'Dark Fountain' no where to be found now.
Minutes later, opening more fountains and testing it out more. Nasha gained 14 more levels before the quest given by [ Great Evil ] eventually stopped giving him the 1000 exp for it, fountain gives exp still but now its a 200 exp gain. Reaching LV 240 after a bit of farming, he stopped and continued to open several dark fountains all over Hometown and the forest.
Not sure how many he needed to open, he flew out of Hometown and went to the giant lake to open a few more there, then other parts of land.
Going over several different continents, murdering everything while opening fountains at the same time- eventually a day pass as he had already wiped out all life. over 130+ 'Dark Fountains' were active.
___
A loud rumble that shook the entire earth. A white pillar of light that dwarf all the darkness that was covering the earth by dark fountains appeared one by one, atleast 3 had just arrived.
Soon, a creature of dark as big as a mountain slowly arose to the Light world- but before it could officially debut, Nasha teleported infront of it's face, using Star Of Gluttony to absorb its skill over Darkness.
[ Gained Skill — Dark Star ]
The Titan roared in anguish before dying to a simple cut of space by Nasha.
[ Gained 3000 EXP! ]
[ Gained 2500 EXP! ]
[ Gained 3400 EXP! ]
He followed up with another flick of space slashes to the other two Titans that appeared. Since some left over exp was in the bar, he had gained 9 levels in a second.
'Wish I could get a reliable EXP machine, but so far the ones that had the potential quickly fizzled out.'
In the end, he destroyed the planet. Atleast he actually got quite a bit from this.
Going back to the system interface, he checked out if he could travel to another AU, luckily he could. Screw that old man!
[ Wish To Travel To |Universe — HORRORTALE| ? ]
This AU required 150+ LV, He's already pass that- already making up his mind, he decided to go... No, taking account for his new trait to steal a skill, he took his attention to another AU he could current go to, needing 200+ LV, being the AU; Reapertale. Nirvana could undergo a massive leap in improvement if he went in here. As well as researching more about Souls
[ Confirm To Travel To |Universe — REAPERTALE| ? ]
He had vanished from the Deltarune AU, while in the abyss- Gaster who had taken Nasha in was disappointed from the lack of growth.
Appearing somewhere in Reapertale, he found himself at a weird place. It seems to be a river of souls? Where even was he?
'This... Is a lucky spawn, I can just absorb it all!'
His empty glowing eye socket glanced at a distance above him, A figure wearing a dark cloak and held a massive scythe... It was Reaper Sans!
____
Reaper Sans POV:
I had been called to the Styx River. A sudden influx of sinful souls had flooded it. If any one of it escapes I'd get a scolding!
as I lazily watch for any problems. My body.. No my entire being! I-i can't move!
A sheer feeling of terror and helplessness sudden washed over me, I panicked, sensing where this feeling is coming from.
My head was drench in sweat, I look down amongst the passing Souls that I was suppose to do consoling...A figure- It disappeared!?
'What the?!? I-i gotta tell Majesty Asgore-'
— * boo.
Pain quickly followed my senses, My ribcage had been pierced by a bony hand. I looked back slowly, that face...Was me.
____
Nasha absorbed Reaper Sans right after piercing his torso at the same time he stole a skill. His instincts told him that if he didn't do it, a attack targeting a soul would've hit him. Like that mattered.
[ Gained 1200 EXP! ]
[ Gained Skill — Reaper ]
Reaching LV 250, and gained a interesting skill. That's value right there. he has no regrets choosing Reapertale now, salivating at the thought of all the skills he can gain here and of course EXP.
He set his sights to the river of souls passing by him, fully using the full strength of [ Star Of Gluttony ]. He gained over 20k+ EXP, and it still kept coming, there were hundreds of billions to trillions of these damn souls here, each giving 10 to 40 EXP!
Manically laughing at the huge gain, he kept continuing, until a minute later a huge boom echoed the space, Nasha dodged a Ethereal-transparent Trident of lightning.
Casually looking back where it came from, he saw the man himself, Asgore. Looking like a average Greek God, well Zeus to be exact. How cliché. Asgore was in rage at he thought was Sans for the daring act in disrupting the balance of the world, immediately striking down NS with a trillion volts of electricity, then mixing it with fire to create a huge explosion.
To what he thought he easily killed came unharmed from the series of attacks, NS smirked, as Asgore hadn't realize he died, a inconspicuous microscopic sized bone had destroyed a part of Asgore's head after going light speed to pierce through.
in quick succession , he stole a skill and absorbed Asgore.
[ Gained 6300 EXP! ]
[ Gained Skill — Plasma Lightning ]
Unfortunately, NS does not really care about a skill like that.
So he set off to speed-run omnicide the entire AU, eventually gaining enough EXP to reach LV 299. Also gained 2 more skills so far, since no one really caught his eye other than Toriel, Sans, Asgore, and finally a interesting choice of Flowey.
[ Life Dominion ] , [ Nightmarish Incarnation ]
The two skills he had gained was interesting to say atleast. It actually gave him the understanding of positive energies, like how Dream Sans does. And one where he interestingly gained some kind of immortality by marking a entity that has complete fear of NS, and gain complete control over them to pupeteer.
[ Nirvana ] , had completely overhauled itself with all the souls nourishing it. Evolving to the new version of it, [ Soul King ] which devoured the skill [ Reaper ] to evolve itself.
________________________________________________________________________________________________
Nasha or our dear mc sans is gonna be called NS for now on mostly. The character sheet might take a week to update since i kinda exhausted myself with this.
This Reapertale is completely my own headcanon and ofc mostly everything here. Can't complain about it when 99% of au's have vague info or just only explains what it mainly changed Undertale in the au.