Codex
Gives back a copy of any Tome card used on it and then self-destructs. +1 copy per level.
- Type
- Building
- Owner
- Rainbow (no king)
- Added
- Patch #30
How players use it
- Rainbow cards by job Copies and merges: Echoform duplicates a plot with all its stats onto an adjacent empty plot; Extraction destroys a plot for 5 copies of its card; Codex returns copies of a tome used on it; Singularity (1.0) merges every identical card into one, summing stats beyond any cap; Unify merges the adjacent troops’ units into the target.
How to get it
- Loot after beating the Jack of Rainbows (twice per run).
- Merchants have a chance to stock one; the Lucky perk and Rare Goods decree raise it.
- Gacha at max level, Diffract and the Refraction decree give random Rainbow cards.
Other Jack of Rainbows buildings
Patch history
- Patch #30
Codex properly gives you a Broken Codex card when you Clone/Earthwork it.
- Patch #30
Fixed some unintended Codex exploits.
Lines from the official Steam patch notes since Patch #18 that name this card.
Data: 9 Kings 1.0 card table on the official wiki, imported 2026-11-13.