various
Vaults of Obsidian

Many are the adventurers brave or mad enough to enter the Blackstone Fortress in search of riches, relics and secrets. Ratlings, robots and rogue traders – and more would-be heroes besides – all pursue their own agendas in a collection of action-packed short stories.
Warhammer 40k
anthology

It contains:
Negavolt
The Beast Inside
Purity Is A Lie
The Last of the Longhorns
Man of Iron
Past In Flames
Talisman of Vaul
Shapes Pent In Hell
Fates And Fortunes
Motherlode
The Three-Edged Blade
The Oath In Darkness