Uploaded February 2021 | Updated September 2026, 1 hour ago

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Swapfell is an Underfell and Underswap AU combination, the fell-ified version of Underswap (not to be confused with Fellswap, which is a swap-ified version of Underfell.)
I find this song in a full soundtrack video , but I didn't find the song here in youtube so I cut that video if somebody need it. Here is the link:
youtu.be/mHE-WxAMtAI