Descent: transmigrated into Undertale

I died.
But I soon found out that I'd been transported to a post-pacifist Undertale timeline.
Now as Zen, a goat-like monster. I'll do my best to ensure this world lives on!
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Wrong, something is truly wrong. Terrorist keep attacking. There's something up with Frisk. The most renowned human prophet has gone mad, saying that the world is doomed. The Dreemurs have adopted a new human child named Kris and some of my memories have been erased by a completely unknown being.

I needed time to think, so I went for a walk. But then I saw it, a melting black shadow eerily smiling at me only to disappear right after.
Seriously, what the f*ck?