From Warhammer 40k - Lexicanum
The Illustraean Veil was among the large number of Chaos artefacts that were stolen from the Dark Angels in M42, during the Siege of The Rock.
When the Dark Angels discovered this, a strike force was tasked with either reclaiming these artefacts or destroying them if need be. The Codicier Yehoel and Interrogator-Chaplain Palaliah were part of the strike force and they succeeded in destroying the Illustraean Veil.
- 1: Codex: Dark Angels (9th Edition), pg. 58 - Crusade Relics