I've been adding some more features. This time I show:
Baron that shoots fireballs in random angles. Depending on the difficulty level, the attack is slightly different.
Radiation suit that functions like Heretic's Tome of Power, powering up weapons. Only the fist is shown, but it's possible with other weapons too.
Arch-vile that may run to an healing station when its health is low. Currently it's a bit hacky and doesn't work with Nightmare/fast monsters.
There's no source code at the end of the video since it's getting a bit long. But you can find it here: https://pastebin.com/p3X5hwuC (also includes stuff shown in other videos)
If you haven't seen my first video about this, then take a look, for context.
• Doom mod with Lua? (early proof of concept)