How to Use the Citadel Book and Debugger In-Game

Citadel adds no world content of its own, but it does ship a couple of tools that are genuinely useful once you know where to look. The Citadel Book and Citadel Debugger are the two you will actually touch.

Opening the Citadel Book

The Citadel Book is the in-game documentation hub. It is not a crafting recipe you need to hunt down in survival progression — it exists so that mods built on Citadel can register their own documentation pages into it. Open it like any other guide book (right-click while held). Inside you will find entries contributed by the Citadel-based mods you have installed, which is the fastest way to check whether a specific mod registered its content correctly.

Using the Citadel Debugger

The Citadel Debugger is a developer/administrator tool. Hold it and right-click on a block or entity to dump information about it — model state, animation state, registered properties, and similar internals. This is what you reach for when a Citadel-based mob is stuck in a T-pose, an animation refuses to play, or a model renders at the wrong scale.

Practical workflow

1. Install a Citadel-dependent mod and launch the game.

2. Open the Citadel Book and confirm the mod's pages appear.

3. If something looks broken in-world, switch to creative, grab the Debugger, and inspect the offending entity or block.

4. Report the dumped data to the mod author rather than guessing at a fix.