Dusttrust Sans

(read the guide, please.)

After a while, you finally reached almost the outskirts of the core, a figure is standing in front of a kind of stadium, when you get closer, he looks at you with bright eyes. "You finally get here, huh, kid?"
"I don't feel ready, but you never know if you never try."
The ground starts to shake, lifting the two of them very high, as if there was no ceiling to stop this, Sans wasn't planning on running, he was going to face you no matter what. "I don't get it..."
"how... why... why would you make us do this infinite song and dance?"
"I went from killing my brother to... killing everybody else, coming here to solve this endless conquest."
Sans generates a purple sword, gripping it firmly as bones roam the battlefield. "Are you proud? Or are you just laughing behind that 'emotionless guy' FACADE?"
"Or is it just boredom leading you to lunacy?"
gaster blasters appear, quickly aiming at you about to fire. "Guess we'll never know, you dirty freak."