DELTABLOCKS - Deltarune Battle System

Every fight in Minecraft becomes a DELTARUNE-style battle.

Hit a mob, let one walk up to you, or get shot at, and the world fades away: you're in a turn-based battle with your party. FIGHT, ACT, use an ITEM, SPARE or DEFEND, then move your SOUL around the box to dodge the enemy's attacks, made of Minecraft itself: rotten flesh, arrows, TNT, cobwebs, slimeballs, ender pearls…

Win and the mob drops its loot as usual. Spare it and it walks away in peace. Lose… and you lose.

Turn-based battles

• FIGHT: stop the bar right on the line. PERFECT hits deal more damage and give more TP.
• ACT: every kind of mob has its own ACTs. Use them to raise its MERCY.
• MAGIC: Brusie's Rude Axe, Woolsei's Heal Prayer and Pacify.
• ITEM: eat the food in your inventory to heal whoever you pick (it's really used up).
• DEFEND: take half the damage and build TP.
• Grazing bullets builds TP too.

Show some mercy

When an enemy's name turns yellow, you can SPARE it. Not every fight has to end in a kill.

Your party follows you

Brusie, a piglin brute with a golden axe, and Woolsei, a green sheep, walk behind you through the overworld and jump into every battle with you. They can't be hurt or pushed, and you can hide them whenever you want.

Two combat styles

Play with the full DELTARUNE look, or switch to a Minecraft-style UI that keeps the battle inside the world. Change it any time from the menu (N → CONFIG).

A stage for every biome

Every biome and structure has its own battle backdrop: deserts, jungles, the Nether, the End, villages, ocean ruins, ancient cities…

Co-op battles

Invite your friends into your party and fight together. Each player takes a character and dodges with their own SOUL in the same box.

PvP duels

Build your own set of attacks from mobs and bosses, then challenge another player to a duel.

Some fights are much more than a mob. Each boss has its own entrance, arena, music and mechanics.

The Allay	The Warden
The Elder Guardian	The Ender Dragon
A very pink Sheep	…and something bigger

Some bosses only show up under special conditions. Finding out how is part of the fun.

Controls

Key	Action
Z / Enter / Space	Confirm
X / Shift / Backspace	Back
Arrows / WASD	Move (menus and your SOUL)
Esc (in the menu)	Flee
N	Open the menu (party, config, invitations)

Commands

• /deltablocks on / /deltablocks off: turn battles on or off
• /deltablocks fight: fight the nearest mob
• /deltablocks party on / /deltablocks party off: show or hide your party

	Status	Notes
Minecraft 26.3	✅
Fabric Loader 0.19.5+	✅	Required
Fabric API	✅	Required
Java 25	✅	Required
Singleplayer	✅	Just install it on your client
Multiplayer	✅	Install it on the server and every client
Forge / NeoForge	❌	Not supported

• The mod is still in development: expect rough edges, and please report anything strange on the Discord.

Can I turn battles off? Yes, with /deltablocks off (and back on with /deltablocks on).

Can I play without the DELTARUNE-style screen? Yes. Open the menu with N, go to CONFIG and set Combat UI to MINECRAFT.

Can I hide Brusie and Woolsei? Yes: /deltablocks party off, or Show Teammates in the CONFIG menu.

Will the mod be ported to other lunchers? Still not sure, but probably yes: I might port it to NeoForge and make a lighter version of the mod for Bedrock Edition.

Thanks to Purple Mattik for being the inspiration for the mod and the creator of some bosses' themes.

Also to ZT, NoteBlockMatt and InstrumentManiac for other in-game boss themes.

To finish, a huge thanks to Toby Fox for being the creator of DELTARUNE, the origin of the combat system's idea, and the original creator of the remixes used in game.

• DELTABLOCKS is a fan-made mod, not affiliated with or endorsed by Toby Fox, Mojang Studios or Microsoft.
• License: GNU.