Eclipse Core Client
Eclipse Core Client is a Fabric library for Cobblemon battles, adding raid frames, a boss window and a battle HUD on the client.
What it does
The mod is a client-side companion to Cobblemon that works with the Cobblemon Eclipse network. It enables double battle gimmicks in Cobblemon, and it provides the core that the other Eclipse features depend on. Only the client needs it, so players install it while servers run without it. Eclipse Core Client requires Cobblemon, Fabric API and Fabric Language Kotlin, and its latest Fabric file, 2.23.1, is built for 1.21.1 and was published on 2026-10-01.
The client-side layer covers party rosters on the side of the screen, draggable two-wide grids with shiny and radiant icons, and hover information. During raids, a boss panel displays a large portrait and a shield meter, and it lists how fast the boss moves. Move tooltips show secondary effects, damage ranges and effect duration, and floating damage numbers appear during battles. Everything is configurable in-game through ModMenu and Cloth Config, and the license is All rights reserved, so the code is not open source.
Key features
Raid boss window
A raid panel shows a large boss picture, a shield meter that tracks each phase, and the boss's speed range.
Targeting and side organization
Target selection works correctly in non-standard battle formats, and allies and enemies are shown on the correct side.
Raid HUD and music
A cheer UI and looping raid music play during raids, with a toggle to turn the music off.
Gimmick limit fix
Doubles and triples battles stop a side from using the same battle gimmick, such as Mega Evolution or Terastallization, more than once per turn.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 3
Use cases
Who it’s for: Players who join Cobblemon servers with raids and battle formats, and developers building raid or multi-battle mods on Cobblemon.
How it compares
Cobblemon QoL is a client-side Fabric mod for 1.21.1 with All rights reserved, covering quality-of-life changes for Cobblemon. Gimme That Gimmick is a server-side mod for Fabric 1.21.1 under a custom license, which covers the same gimmick topic from the server side. [Cobblemon] TrainerAttributesLib runs on both client and server for Fabric 1.21.1 under All rights reserved. Wild Battle API runs on both client and server for Fabric and NeoForge 1.21.1 under All rights reserved.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Eclipse Core Client | Fabric | 1.21.1 | Client-side only | 2026-10-01 |
| Cobblemon QoL | Fabric | 1.21.1 | Client-side only | 2025-12-28 |
| Gimme That Gimmick | Fabric | 1.21.1 | Server-side only | 2026-10-14 |
| [Cobblemon] TrainerAttributesLib | Fabric | 1.21.1 | Client and server | 2026-07-18 |
| Wild Battle API | Fabric and NeoForge | 1.21.1 | Client and server | 2026-03-16 |
Questions
Does Eclipse Core Client need to be installed on the server?
Which dependencies does Eclipse Core Client need?
Is Eclipse Core Client available for other loaders or versions?
In the catalog
Eclipse Core Client is one of 3,514 Library mods on ModsFinder, and one of 2,348 Library mods for Fabric. 32,366 mods support Minecraft 1.21.1.
More from Cobblemon Eclipse
Similar mods
What the author says
The client-side companion mod for the Cobblemon Eclipse network, and a full battle HUD overhaul that works on any Cobblemon server. Everything is configurable in-game via ModMenu + Cloth Config.
Official listing
- Modrinth page
- modrinth.com/mod/eclipse-core-client
- Owner
- Cobblemon Eclipse
- Published
- 2026-01-06
- Updated on Modrinth
- 2026-10-01
- Facts verified
- 2026-10-15