The Other Side. Undertale.(REWRITE)

This is based on an AU I made and a rewrite of the first version of this book (obviously.
Sans decides to go into the woods called 헬리오 포비아 fo a taste of adventure. The forest has had rumors that it blocks out the magic of the monsters that have entered and made it out alive. The woods are well known for their dangerous outcomes. They're 4 types of outcomes: the first outcome is bruised up and extremely nauseated, the second outcome is having cuts and bruises all over and in a comatic state, the third outcome is having multiple broken bones and large gashes but not in fatal areas and the third and final outcome is dead.
But with a new friend and a new arrangement of powers, will he make it out alive of this satanized place. Read to find out!
This will also contain slight gore but will be rare through-out the story.
It will also contain a lot of swearing (Most likely in every chapter).