I could make it but you are trivialising the work by saying it is only a battle system, I could not just make it and show you, it would take a while to make, it's a large project. You need to first decide which enemies will spawn and apply all stats. You need to have enemies acting in turn with their own decision making, and all of these attacks need to affect the player. You need to be able to damage and apply statuses to enemies and detect when they die, take them out of the turn based system. You need to then add XP gained, loot and other things that decide the end of the battle. Probably a bunch of bug fixes too along the way. What you are describing that you have already done with the stats sheet, that is the design.