An arena in RPG Maker is usually a menu of fights. You pick an opponent, you win, you take the gold, and nothing accumulates. There is no championship: no bracket, no rival who remembers beating you last month, no season that ends with somebody holding a belt.
Colosseum Core is that missing structure, and it deliberately does not touch the fighting. <strong>Battles run through your battle system untouched</strong> — the player fights real battles exactly as they do now. What this plugin owns is the shape around them: seeded brackets that fill in as you win, weight classes, seasons, belts, and rivals who persist between tournaments, level up while you are away, and remember your head-to-head record.
Matches you are not in still have to happen, and they resolve <strong>deterministically from the tournament seed</strong> rather than by a die roll. The consequence matters more than it sounds: the same season plays out the same way on every machine and in every save file, so the bracket you are looking at is a fact about the tournament rather than a re-roll each time the scene opens.
The board is a <em>diagram</em>, drawn line by line — results land as brass strokes toward the final, eliminated fighters crack and fade, the champion’s path burns gold, and your own chip is ringed when you are due in the arena. There is <strong>no Window_Base, no windowskin and no default font anywhere in these scenes</strong>. Every mark is drawn into a Bitmap once and animated by moving sprites, so the board costs almost nothing per frame, and the season ledger only ever draws the rows you can actually see however long your roster gets.
Crests are generated, not supplied. Each fighter’s heraldic shield is derived from their id, so every rival you invent gets a distinct crest with no art to draw and no file to ship — and the same id always produces the same crest. The palette (slate, brass, parchment, crimson and gold) is set once in Colosseum Core’s parameters and shared by every colosseum screen, so the bracket and the ledger cannot drift apart.
Where to get it: the itch.io page linked above, which shows the current price. The plugin is paid. The download ships readable, unobfuscated JavaScript — no minification — plus a LICENSE.txt. Commercial use in your games is permitted; redistribution of the plugin source itself is not, which is why this entry links to the plugin rather than hosting the file.
AI disclosure: the code and the store images for this plugin were generated with AI assistance, and this is disclosed on the itch.io listing as well.
Note on the help text below: this site strips angle-bracket characters from submitted text. Colosseum Core’s help happens to use none, so the block below is reproduced exactly as it ships inside the plugin.
