It's just a bunch of ASM codes (mostly level ASM + sprites) that you can put in a specific level to execute that RPG battle thing. I was coding it in a user-friendly way that would let anyone customize the enemy and the party. This includes creating your own attacks/effects and choosing which one will be available. As you can tell, I was going to release it, but I couldn't touch the project since the day I released this video due to my classes, and at the current state, there's no actual battle system, just some random effects coded. Using destroyer was just as an example. Personally, I really like this boss, but as I said, it would be totally customizable when finished, as long it's just one enemy (which could cast multiple spells in a single turn).
If I ever have time to finish it and conclude it's actually releasable, I'll be sure to do it.
If I ever have time to finish it and conclude it's actually releasable, I'll be sure to do it.