From Warhammer 40k - Lexicanum
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Unverrdt IX is an Imperium Forge World that lies near Baal. As a result of this, it has close ties to the Blood Angels Chapter.
These ties led the Blood Angels to call upon Unverrdt IX to aid them when the Great Rift made it too dangerous to send their mechanically inclined Battle Brothers to be trained as Techmarines on distant Mars. A deal was soon struck between them and, in return for the Blood Angels' offered martial aid, the Forge World would train new Techmarines for the Chapter. It is a deal that has proven beneficial to both Baal and Unverrdt IX in equal measure.
- 1: Codex: Blood Angels (8th Edition), pg. 55 — Techmarines