Editing Warhammer 40,000/8th Edition Tactics (section)

===Making the most of Detachments===
*You get to choose a special ability for each Detachment in your army if all the units in that Detachment share a specific keyword, although sometimes Auxiliary Support Detachments and/or Super-heavy Auxiliary Detachments do not benefit from these abilities, in addition, Chaos Space Marines don't get the benefit for these abilities except on Infantry, Bikes, and Hellbrutes and a few units in other armies are also exempt like Necron C'tan. These special abilities can play a huge role in how powerful a unit is and how it should be used most effectively, grouping units together so that all units in your army benefit from the most beneficial special ability for that unit can make your army more successful, although it might limit the benefits your characters can give to what units. You can read what special abilities are available to different factions in the faction army tactics pages found at the bottom of this article. 
*FAQs have explicitly stated that detachments whose different sub-faction keywords (such as {{WH40Kkeyword|Chapter}} and {{WH40Kkeyword|Regiment}}) have the same name do not allow buff sharing, so don't get cheeky by naming your custom IG regiment "Ultramarines" and expect it to do anything beyond making you look like a dick.
*{{WH40Kkeyword|IMPERIUM}} Space Marines gain additional rules when the entire list contains nothing but Adeptus Astartes and an additional rule if the entire list contains nothing but models from a single Chapter sub-faction, the only exceptions are Deathwatch and Space Wolves which have yet to be updated in Psychic Awakening. Sisters of Battle likewise gain an additional rule if their army contains nothing but Adeptus Ministorum units.