Based on my story of the same name.

I'm having fun writing this wonderful little story, and I don't deserve the full credit of coming up with two worlds that would mesh perfectly...That honor goes to someone who actually came up with an Undertale themed Keyblade before I even had the notion that it was a wonderful idea. That someone is, Tanukiyasha who now as I type this goes by BAClash on DeviantART, they made the keyblade back when Undertale was still just a demo all the way in 2013.

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