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Originally Posted by kenshin620  well I checked the codex so the only army that can have grenadiers is cadia? |
if you look you can create your own custom regiment with the doctrine system. You get 5 doctrine points, so can pick up to 5 special abilities or traits for your regiment.
the disadvantage of doing this as opposed to running a generic army is you won't have a full selection of units. Storm troopers, conscripts, psykers, priests, rough riders, and abuman troops all become restricted, and it costs a point to include that each unit type in yer army.
on the upside, theres lots of stuff and traits that generic armies cant take, such as grenadiers, or iron discipline. The only way to get these things is the doctrine system.
the regiments in your codex are existing guard regiments that use the doctrine system. Cadia has some 8 doctrines, but thats because its famous like ultramarines. some special characters can only be used with a certain army in that list.