Nova Quantum
by Seidr Labs
Nova Quantum is a Fabric companion mod for Minecraft 1.21.11 that adds a voice-controlled AI character who joins the world as a real entity.
What it does
Once the companion is in the world, she listens to spoken commands and works beside the player on mining, crafting, building, defending and following, using the same vanilla rules a player follows. A mining request makes her search for ten diamonds, dig down a stair pattern to stay safe, and follow cave paths with vanilla navigation. She can switch between a sword and a bow and engage hostile mobs nearby.
Voice features call the OpenAI API with a key the player supplies, so the mod talks to one external service for its AI features. It boots and loads without a key, but the companion stays silent and cannot understand spoken commands until one is entered. Conversation memory lives locally, and only the last several turns are stored in the Minecraft save folder. Seidr Labs telemetry is not part of the mod, and no audio prompts go to a Seidr-controlled server. Nova Quantum is published by Seidr Labs and released under the MIT License; it is not open source. Files are published only for 1.21.11, with 0.8.176 as the latest Fabric build, and the mod requires Fabric API.
Key features
Voice-controlled companion
She is a real entity in the world and responds to spoken commands during play.
Vanilla-rule behavior
Mining, crafting, building and defending follow the same rules a player would use.
Cave navigation
She follows a player through caves by pathing behind them with vanilla navigation.
Combat loadout
She switches between a sword and a bow and engages hostile mobs near her.
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 1
Use cases
Who it’s for: Players who want a spoken-command companion in single-player worlds, and who are willing to supply their own OpenAI API key for voice features.
How it compares
Nova MC Companion is a Fabric companion for 1.21.11 that runs on the client and server and is released under All rights reserved, not open source. Voice Command is a Fabric mod for 1.21 that is client-side only and also under All rights reserved. CraftGPT is client-side only, under the MIT License, and covers 1.21 – 1.21.1, so it targets earlier versions than Nova Quantum.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Nova Quantum | Fabric | 1.21.11 | Not published | 2026-06-22 |
| Nova MC Companion | Fabric | 1.21.11 | Client and server | 2026-05-02 |
| Voice Command | Fabric | 1.21 | Client-side only | 2026-03-29 |
| CraftGPT | Fabric | 1.21 – 1.21.1 | Client-side only | 2024-09-08 |
Questions
Does Nova Quantum need Fabric API?
Does the companion work without an OpenAI key?
What does voice use cost?
Where is conversation memory stored?
In the catalog
Nova Quantum is one of 11,058 Mobs mods on ModsFinder, and one of 5,189 Mobs mods for Fabric. 19,862 mods support Minecraft 1.21.11.
Similar mods
What the author says
By Seidr Labs — a Fabric mod that adds a voice-controlled AI companion to your Minecraft world. Quantum is a Fabric mod for Minecraft 1.21.11. She joins your world as a real entity, listens for spoken commands, and plays beside you — mining, crafting, building, and defending — while following the same vanilla rules…
Official listing
- Modrinth page
- modrinth.com/mod/nova-quantum
- Owner
- Seidr Labs
- Published
- 2026-05-13
- Updated on Modrinth
- 2026-06-22
- Facts verified
- 2026-10-15