not a boss fight just a still image If this was an actual boss, You would be Level 19.5 with 94 Max HP, KR on, somehow harder than the regular Sans fight, Act and Mercy would be broken by bones or Gaster Blasters, and he wouldn't be able to dodge, so to make up for it, his determination would give him 900 HP. If you try to use Act or Mercy, you'd be damaged. Sans would also have his blue eye the entire fight. The more you hit him, the more blood appears. Also, the bones in the menu from the official final stage would be there for the entire match. He would have 3 phases, and in the final phase, he'd do the slam he does at the end of his fight, knocking you all the way back to level 1. He'd be too tired by doing that he'd take a knee, and you'd be sent a barrage of slow attacks, until he gets back up, no longer tired, and when you're about to deal the final blow, he'd barely dodge, and your knife would rip some of his jacket. He'd do a double spin of Gaster Blasters, then attempt to dunk on, but the double Gaster Blaster spin would've cracked the battle box and created a hole just big enough for you to slip out of it. His turn would end, and he'd again take a knee, being tired. Here, you'd be able to deal the final blow. Sans wouldn't even say anything, and he'd just melt into dust, like Undyne did. You'd be awarded enough XP to get you all the way back to Level 20, where you'd have 99 HP. Then you move onto the next room where Chara waits. If you refuse to erase this world, this activates the Chara fight (not official). I feel like I over-explained this.
:P Undertale i did not make the STMPWYFS cover
