The Legendary Legend Of The Legendary Staple

A long time ago, in a galaxy far, far away... Wait, what do you mean that's the wrong intro? Ok sheesh, I'll do it again.

Only yesterday, just next door at Grillby's... Sans posted a prophecy on the UnderNet: "here in a few days, some weird and extremely random stuff is gonna happen. a group of four adventurer type people will be transported across the multiverse, and this weird journey across space and time will make them grow to become friends. the journey is some kind of fetch quest, which will allow them to find this giant staple. it's some kind of super powerful magical artifact from another universe. to be honest i don't know much about them, but if you see them travelling through the underground, don't fight them or anything. they are on a quest and don't need that stress."