Monmusu quest style battle system

[Emiya24]

Has anyone had any success with making a simple battle system like monmusu?

I was planning on adding one to my VN so it wont be too bland

basically js a front perspective battle interface with
Health
Mana
(another space js incase of another energy source)

and something you can alter like if enemy is below 500 health a dialogue will play
or if protagonist survive 10 turns a new attack would be revealed

[KimiYoriBaka]

if you just mean the interface, then all you really have to do is play around with the screen language stuff and make variables for each stat and bar to keep track of everything. once you have a screen that looks right, you can put it in a loop (either a while loop or just a label that jumps to itself) and have any buttons for attacks or actions jump to a label that adjusts some values and jumps back. if you need to keep track of the number of turns, you can also have the labels for actions jump to another label that just increments the turn counter and checks for any events based on it.

the bigger task is making the battle system itself. if you just want to send the main character into battle for the sake of making things interesting, I suggest that you make the main character OP so that you don't need to spend the time balancing everything. on the other hand, if you actually want it to feel like Monmusu, you'll need to really carefully consider every encounter so that it feels like a puzzle.

[DaFool]

Just search for Jake's Battle Engine it can handle this but you'll have to throw all the bells and whistles out and stick to the simple battle.