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How to write a custom battle system

BMM Archive · July 16, 2026

Preserved forum archive. This topic stores the original first post and locally mirrored RPG Maker Web attachments when available. It is posted by the BMMPlay archive account, not by the original creator.

Original Source

  • Original title: How to write a custom battle system
  • Original author: Kazuki
  • Original date: December 7, 2014
  • Source thread: https://forums.rpgmakerweb.com/threads/how-to-write-a-custom-battle-system.34725/
  • Source forum path: Game Development Engines > Ruby Game System (RGSS) Scripts > Learning Ruby and RGSSx

Summary

I was wondering if any would know how to help me get started on my game's battle system. The main party will consist of 3 characters. The main objective of the battle system is to combine different elements together to create your attack. The main three elements being fire, water, and earth. Also there are secondary elements that can be made when combing the base element here a list of them: fire+water=steam  fire+earth=lava  earth+water=ice  fire+earth+water= Ultimate element in the game. You also have to combine items by using a bottle...

Archived First Post

I was wondering if any would know how to help me get started on my game's battle system. The main party will consist of 3 characters. The main objective of the battle system is to combine different elements together to create your attack. The main three elements being fire, water, and earth. Also there are secondary elements that can be made when combing the base element here a list of them: fire+water=steam  fire+earth=lava  earth+water=ice  fire+earth+water= Ultimate element in the game. You also have to combine items by using a bottle and various ingredient items to create the main item you are going to use. To make the controls more streamline you toggle through your elements and ingredient items by pressing the up and down arrows. The elements and the bottle have levels which determine its strength, you have to toggle through with the right and left keys.  There is also a timer so the player has to think on their feet however, you can access the combos you have learned through an item or reaching a certain level.

 The Z key is to confirm your decision, X is to cancel, R is to access the combos you have learned, D is to defend and V is to escape battle. There is also an AP system so the player doesn't use powerful attacks all the time without consequence. The Max total of AP you can gain is 18 and the player starts with 9 at the start of battle. The elements consume AP based on what level they are, each element starts at 1 and ends at 3. The different ingredient items consume different amounts of AP. There are also certain combos that are exclusive to that certain character and only they can use it. 

I have also attached a doodle of how I would like to set up the UI in battle. I am using the yanfly scripts to achieve the visual battlers and the visual enemiesas well.

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UI drawing.jpg
UI drawing.jpg
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