Cities of Death

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This. And even more terrain in form of ruins. All that glorious 4+ cover!!

Cities of Death is an expansion for Warhammer 40,000, published by Games Workshop in 2006. Its theme is urban combat, as opposed to the relatively sparse terrain of typical Warhammer 40,000 battles.

To that end, it features guidelines for setting up dense terrain (not so close that nobody can fit anywhere, while staying close enough together to restrict movement and lines of sight -- generally two to six inches), rules for moving and fighting inside terrain, "stratagems" that could be employed by armies to represent strategies or assets used by armies specializing in urban combat, and new mission rules for city fights.

The rules for moving and fighting in terrain were mostly folded into the main rules in Fifth Edition, while some of the stratagems are outdated by rules changes or superseded by Sixth Edition's "warlord traits". At least the advice on modeling dense cities is still pretty good.