Aside from the well, there are mirrors that also act as a gateway to the Underealm. There aren't that many though, mostly because mortals occasionally get dragged through. Plus some mirrors were slightly faulty and the reflection they showed was that of the Underealm.
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Creepypasta Headcannons
FanfictionI've read so many of these headcannon books, so I thought why not make my own?
