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You can make custom monsters, or enemies. And it isn't limited to just battles, either! There is a whole Overworld engine included!Everything that you could possibly need to make your dream Undertale Fangame is right here. The various screenshots to your right were all made in the engine.
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However, since I am now the one who does it, I am updating the engine. The Undertale Engine by TML is one that many have used to create fangames like TO!Ink Sans Fight, Gaster Blaster Sans Fight, SpookyTale, Undertale: Knowledge, and plenty of others! TML is no longer maintaining the engine, sadly.
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