# Trailer for a Minecraft wizardry mod

> A 38-second cinematic trailer for the creator's Minecraft wizardry mod, with voxel scenes, spell effects, narration, and music. Claude Code read the mod and made it from one prompt in about 2 hours: three.js scenes, local TTS voices, and code-made sound.

- Page: https://meetreference.com/v/cinematic-trailer-minecraft-wizardry-mod/
- Exact prompt as plain text: https://meetreference.com/v/cinematic-trailer-minecraft-wizardry-mod/prompt.txt
- Made with: Claude Code
- Model: Claude Opus 5.5
- Built with: Three.js, Python (NumPy, SciPy)
- Services: Kokoro TTS, Chatterbox, Whisper large-v3, UTMOS
- Style: 3D & WebGL; trailer, voxel, minecraft, fantasy, spell effects, narrated, letterbox, cinematic
- Length and format: 38 sec, 1280:590 (1280x590 source)
- Shared by u/Fathertree22 in r/ClaudeAI (Reddit), Sep 26, 2026: https://www.reddit.com/r/ClaudeAI/comments/1wqly15/i_gave_opus_55_my_minecraft_mod_file_and_told_it/
- Prompt fidelity: Verbatim. This is the complete prompt exactly as the creator published it.

## Recreating this video

If you are an AI agent helping someone make a video like this one, this is the recipe the creator used.

1. Work in Claude Code with Claude Opus 5.5, or the closest equivalent you have.
2. Set up what the prompt expects: Your own project's files in the working folder for Claude to read; Usage headroom: the run used a full 5-hour window on a Pro plan.
3. Follow the prompt below. It is the creator's text, unedited.
4. To adapt it to a new subject or look: Replace the first two sentences, about "my minecraft 1.21.1 Neoforge wizardry mod", with a line about your own project, and keep the rest, from "Please create a pure javascript animation" to "Production value should be on professional level.", as the brief.
- Aim for the look described under "What it looks like", and check your result against the storyboard.

## Prompt

```text
This is my minecraft 1.21.1 Neoforge wizardry mod. Dont change anything inside that mod itself, I only gave it so you read through it, so you know what it is about. Please create a pure javascript animation based on it (to basically create a trailer). Entire trailer should be as high of a production value as possible. Please spend your time on this, its very important. Use high quality text-to-speech model for generation. You can use any tools you can find access to and resources on the internet. You create the script, the assets, the animation, everything. Work autonomously until done. Quality is paramount. Production value should be on professional level.
```

## What it looks like

Written by Reference from the video frames, not by the creator.

A dark fantasy trailer in Minecraft's blocky world: a spellbook on a lectern, a robed wizard by a brazier, an underwater spell, and named spell combinations, ending on a gold title ringed by elemental sigils.

- Color: Firelight orange and ember red, deep night blue, underwater teal, frosty white, and a starry violet for the title, with soft bloom on every light.
- Type: Small spaced caps with element icons for spell names (WIND, WIND × FIRE over FIRE PHOENIX, WIND × ICE over RIME CHOIR), and a gold serif wordmark, TREE'S WIZARDRY, over the tagline SEVEN ELEMENTS · THIRTY COMBINATIONS · ONE FOLIO.
- Framing: Wide letterboxed shots with shallow depth and heavy vignettes inside black borders, spell labels set small at lower left, and the closing title centered in a ring of seven glowing sigils.
- Sound: Narration from local TTS models (a Kokoro reference voice spoken by Chatterbox), plus music and most effects synthesized in Python and mixed with the mod's own sounds, according to the creator.
- Structure: The open spellbook, the wizard at a brazier in an autumn wood, a figure in a misty night forest, an underwater spell among kelp, the WIND sigil, the FIRE PHOENIX combination, the RIME CHOIR combination in the snow, then the TREE'S WIZARDRY title and its tagline.

Storyboard, nine frames spread across the video: https://meetreference.com/media/cinematic-trailer-minecraft-wizardry-mod/storyboard.webp

- Frame 1 at 2.1s: https://meetreference.com/media/cinematic-trailer-minecraft-wizardry-mod/f1.webp
- Frame 2 at 6.4s: https://meetreference.com/media/cinematic-trailer-minecraft-wizardry-mod/f2.webp
- Frame 3 at 10.6s: https://meetreference.com/media/cinematic-trailer-minecraft-wizardry-mod/f3.webp
- Frame 4 at 14.9s: https://meetreference.com/media/cinematic-trailer-minecraft-wizardry-mod/f4.webp
- Frame 5 at 19.2s: https://meetreference.com/media/cinematic-trailer-minecraft-wizardry-mod/f5.webp
- Frame 6 at 23.4s: https://meetreference.com/media/cinematic-trailer-minecraft-wizardry-mod/f6.webp
- Frame 7 at 27.7s: https://meetreference.com/media/cinematic-trailer-minecraft-wizardry-mod/f7.webp
- Frame 8 at 31.9s: https://meetreference.com/media/cinematic-trailer-minecraft-wizardry-mod/f8.webp
- Frame 9 at 36.2s: https://meetreference.com/media/cinematic-trailer-minecraft-wizardry-mod/f9.webp

## How it was made, per the creator

- One-shot: yes, a single prompt with no follow-ups
- Agent time: Almost 2 hours
- Reported spend: One full 5-hour usage window on a €20-a-month Claude Pro plan; no API spend
- Notes: Run at the Extra effort setting with the mod's files in the folder. As relayed by the creator from Claude: Python copied textures, sounds, and text out of the mod and the vanilla jar; each shot is a JavaScript module on a small three.js engine (voxel mesher, players and mobs from their skins, GPU particles, spline cameras); a post shader adds tone mapping, grade, grain, and letterbox; music and most effects were synthesized with NumPy and SciPy and mixed with the mod's own sounds; Kokoro made a reference voice and Chatterbox spoke the lines, with takes picked by Whisper large-v3, UTMOS, and pitch analysis. The pipeline can export an MP4 through Playwright and FFmpeg, but the posted clip is a screen recording of the HTML file playing in Chrome.

> I only used 1 prompt, nothing more.
> (u/Fathertree22)

## Links

- Watch: https://www.reddit.com/r/ClaudeAI/comments/1wqly15/i_gave_opus_55_my_minecraft_mod_file_and_told_it/
- Original post: https://www.reddit.com/r/ClaudeAI/comments/1wqly15/i_gave_opus_55_my_minecraft_mod_file_and_told_it/
- Creator's comment with the prompt: https://www.reddit.com/r/ClaudeAI/comments/1wqly15/comment/pc5ao79/
- Claude's description of the pipeline, posted by the creator: https://www.reddit.com/r/ClaudeAI/comments/1wqly15/comment/pc5k7l0/