Mind I guess what you're waiting for? Is it another soul? Because you obviously don't have one any more. Or did you not have one before you came to the underground? SAY SOMETHING! WHY ARE YOU JUST STANDING THERE?! H-Here! Take all my gold! J-Just please don't hurt another one of us! What is it that you're trying to accomplish? An ERASE? Or do you just enjoy the sensation of ending a life? Or.. is it something else entirely?

The underground is empty, correct? So either you have dusted everyone... or they are all on the surface... Soulless. A consequence. Genocide. Nobody was ever here. You are in control? Yes, of an empty world. You've killed Toriel? We guess it's a lie. 5 minutes? To walk to the Barrier? Ability to reset? The void won't change. Ok everyone, back it up. We don't know what the hell happened and what they are capable of. We have to keep calm and figure out what this thing is and why it looks like Frisk, or why Frisk looks like it. 

Hey buddy? Can monsters die of a broken heart? Is it possible for monsters to die of sadness? Emotions can either increase or decrease the production of important hormones such as adrenaline. Adrenaline has the effect of narrowing the main arteries, putting a person in a situation where they may die of heart failure. Humans can die of sadness and a broken heart. I just wanted to know about if monsters can die of sadness and a broken heart. If we are wrong with our assumptions, correct us. We need more information.