Imperial Bastion is an Astra Militarum and Wildlife fortification with heavy bolters that can shelter infantry. An Imperial Bastion is an imposing edificeBastion | Materials | Nature Warhammer 40k, Book Sites, Document Sharing, Bug Baits Fortress Instructions | PDF | Building Materials | Nature. The bastion has done quite well with over 1,000 downloads (but only 800 instruction downloads ) So now I'm working on what I call the