In an outstanding display of giving the customer what they want, in order for Steam users to purchase Warhammer 40K: Storm of Vengeance, which is developed by Eutechnyx, they must first buy Warhammer 40K: Space Hulk, a title developed by Full Control Studios.
Users in this forum, on the game's discussion page, are reporting an error preventing them from purchasing this title as they do not own Space Hulk, with Steam user WARLORD stating this:
Here is the Error Message: Your transaction failed because you are trying to buy 'Warhammer 40,000: Storm of Vengeance' which requires ownership of 'Space Hulk'. Please correct the error and try again.
I've contacted the developers for a statement regarding this situation, and hopefully it is as unbelievable as it seems. Considering that both titles were made by two different developers, I'm hoping it's a fabricated story. And I certainly hope it's not Games Workshop forcing gamers to buy both.
But that wouldn't surprise me.
[Update 1] WARLORD has uploaded a screenshot of the error:
[Update 2] Denton Fletcher, of Eutechnyx, has responded to the issue:
It's a temporary bug that's appeared as Valve were setting up some cross title DLC for us. It'll be resolved very soon. Thanks for letting us know
Storm of Vengeance is a lane strategy title, much akin to the very popular Plants Vs. Zombies series, and was released April 3. Gamers are given the choice to play as the Dark Angels chapter of the Space Marines, whom defend the planet Piscina IV, or as the Ork Waaagh! who attempt to destroy it.