There's not really an engine. Just made from scratch. Used the MGL engine, and then I think SDL in later ones, or some other things, but those aren't "game engines" they're just graphics engines. All the game code is homegrown.
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Yes, the best Fantasy Role Playing Game On The PC did come out in its own big box! I have one on my shelf. It's from back when game boxes were BIG, maybe 8"x11" or something, and an inch thick. With cool embossed shiny art on the front. Good luck finding one.