Editing Army compatibility between Warhammer settings

Here is a list of all armies that have been part of the many "[[Warhammer]]" settings, and in how many of them they're playable. 

'''Disclaimer''': This list takes into account the rules, not the models. For example, all elf models can be used on eldar lists as "count as", and vice versa, but that doesn't mean they have similar rules. This list is more interested in armies that keep similar rules and named units in all settings.
*To make things easier, some factions that share a lot of similarities will be counted together. The one exception will be orc(k)s in general, due to all of them being wildly different in each setting.
*Also, this list doesn't take into account the smaller specialist games, such as [[Kill Team (Specialist Game)|Kill Team]], [[Warcry]], [[Warhammer Underworlds]] or [[Bloodbowl]]. Thus, their exclusive factions are not included here. 
*While the list of the playable armies in TOW will be almost identical, if not 100% identical to the old WHFB armies, we'll keep the TBD tag until we get official confirmation. The only exception will be the armies that won't make sense being there (aka, the 40k ones).

'''Disclaimer 2''' Quite a lot of this is outdated.
==The List==

{| class="wikitable"
|-
! Army
! [[Warhammer 40,000]] (40K)
! [[Horus Heresy]] (30k)
! [[Warhammer Fantasy Battle]] (WHFB)
! [[Age of Sigmar|Warhammer: Age of Sigmar]] (AoS)
! [[Warhammer: The Old World]] (TOW)
! Total games playable.
|-
| [[Space Marines]] ("Codex" SM, [[Deathwatch|DW]], [[Grey Knights|GK]], [[Blood Angels|BA]], [[Space Wolves|SW]], [[Dark Angels|DA]])
| Playable	
| Playable (albeit heavily modified; DW and GK are non playable)
| Non Playable	
| Non Playable	
| Non Playable
| 2 (1 for DW/GK)

|-
| [[Imperial Guard]] (AM, [[Tempestus Scions| Scions]], first half of Militia and Cults)	
| Playable
| Playable	
| Non Playable	
| Non Playable	
| Non Playable
| 2

|-
| [[Solar Auxilia]]
| Non Playable
| Playable
| Non Playable
| Non Playable
| Non Playable
|1

|-
| [[Adeptus Mechanicus]] (AdMech/Mechanicum)	
| Playable
| Playable	
| Non Playable	
| Non Playable	
| Non Playable
| 2

|-
| [[Imperial Knight|Imperial Knights]] (IK)	
| Playable
| Playable	
| Non Playable	
| Non Playable	
| Non Playable
| 2

|-
| [[Adeptus Titanicus|Adeptus Titanicus]] (Titans)	
| Playable
| Playable	
| Non Playable	
| Non Playable	
| Non Playable
| 2

|-
| [[Sisters of Battle]]/[[Ecclesiarchy|Adeptus Ministorum]] (SoB)	
| Playable
| Non Playable	
| Non Playable	
| Non Playable	
| Non Playable
| 1

|-
| Talons of the Emperor ([[Adeptus Custodes|AC]], [[Sisters of Silence|SoS]])	
| Playable
| Playable	
| Non Playable
| Non Playable
| Non Playable
| 2

|-
| [[Officio Assassinorum]] 	
| Playable
| Non Playable	
| Non Playable	
| Non Playable	
| Non Playable
| 1

|-
| [[Inquisition]] (Inq)	
| Playable
| Non Playable	
| Non Playable	
| Non Playable	
| Non Playable
| 1

|-
| [[Squats]]/Leagues of Votann
| Non Playable, Soon to be Playable
| Non Playable	
| Non Playable	
| Non Playable	
| Non Playable
| 0, soon to be 1

|-
| [[Chaos Space Marines]] (CSM, [[Death Guard|DG]], [[Thousand Sons|TS]], Traitor Legions/Warbands, Traitor/Renegade Warbands)	
| Playable	
| Playable
| Non Playable	
| Non Playable	
| Non Playable
| 2

|-
| [[Chaos Daemons]] (CD)	
| Playable
| Playable	
| Playable	
| See Alliance: Chaos	
| TBD
| 4

|-
| [[Chaos Knight|Renegade Knights]] (RK)	
| Playable	
| Playable
| Non Playable	
| Non Playable	
| Non Playable
| 2

|-
| [[Lost and the Damned|Lost and Dammned]] (Renegades and Heretics, second half of Militia and Cults)		
| Playable	
| Playable
| Non Playable	
| Non Playable	
| Non Playable
| 2

|-
| [[Eldar]] (Cr, [[Dark Eldar|DE]], [[Harlequins|Har]], [[Ynnari]])	
| Playable	
| Non Playable
| Non Playable	
| Non Playable	
| Non Playable
| 1

|-
| [[Tyranids]] (Nids, [[Genestealers|GSC]])	
| Playable
| Non Playable	
| Non Playable	
| Non Playable	
| Non Playable
| 1

|-
| [[Necrons]] (Nec)	
| Playable
| Non Playable	
| Non Playable	
| Non Playable	
| Non Playable
| 1

|-
| [[Orks]]	
| Playable
| Non Playable	
| Non Playable	
| Non Playable	
| Non Playable
| 1

|-
| [[Tau]] 	
| Playable	
| Non Playable
| Non Playable	
| Non Playable	
| Non Playable
| 1

|-
| [[The Empire (Warhammer Fantasy)|The Empire]]	
| Non Playable	
| Non Playable
| Playable	
| See Alliance: Order 	
| Confirmed
| 2

|-
| [[Bretonnia]] 	
| Non Playable	
| Non Playable
| Playable	
| See Alliance: Order 	
| Confirmed
| 2

|-
| [[Kislev]] 	
| Non Playable	
| Non Playable
| Playable	
| Non Playable	
| Confirmed
| 2

|-
| [[Cathay]]	
| Non Playable	
| Non Playable
| Non Playable	
| Non Playable
| Confirmed
| 1

|-
| Elves ([[High Elves (Warhammer Fantasy)|HE]], [[Dark Elves (Warhammer Fantasy)|DE]], [[Wood Elves (Warhammer Fantasy)|WE]])	
| Non Playable	
| Non Playable
| Playable	
| See Alliance: Order 	
| Confirmed
| 2

|-
| [[Dwarfs (Warhammer Fantasy)|Dwarfs]]	
| Non Playable	
| Non Playable
| Playable	
| See Alliance: Order 	
| TBD
| 2

|-
| [[Tomb Kings]]	
| Non Playable	
| Non Playable
| Playable	
| See Alliance: Death	
| TBD
| 2

|-
| [[Vampire Counts]]
| Non Playable	
| Non Playable
| Playable	
| See Alliance: Death	
| TBD
| 2

|-
| [[Lizardmen]]/Seraphon	
| Non Playable
| Non Playable	
| Playable	
| See Alliance: Order 	
| TBD
| 2

|-
| [[Orcs & Goblins]]	
| Non Playable
| Non Playable	
| Playable	
| See Alliance: Destruction 	
| Confirmed
| 2

|-
| [[Ogre Kingdoms|Ogres]]
| Non Playable	
| Non Playable
| Playable	
| See Alliance: Destruction 	
| TBD
| 2

|-
| [[Warriors of Chaos]]	
| Non Playable	
| Non Playable
| Playable	
| See Alliance: Chaos	
| TBD
| 2

|-
| [[Chaos Dwarfs]]	
| Non Playable	
| Non Playable
| Playable	
| See Alliance: Chaos	
| TBD
| 2

|-
| [[Beastmen]]	
| Non Playable	
| Non Playable
| Playable	
| See Alliance: Chaos	
| TBD
| 2

|-
| [[Skaven]]	
| Non Playable	
| Non Playable
| Playable	
| See Alliance: Chaos	
| TBD
| 2

|-
| [[Stormcast Eternals]]	
| Non Playable
| Non Playable	
| Non Playable	
| See Alliance: Order 	
| TBD
| 1

|-
| [[Daughters of Khaine]]	
| Non Playable	
| Non Playable
| Partially Playable	
| See Alliance: Order 	
| TBD
| 1

|-
| [[Fyreslayers]]	
| Non Playable	
| Non Playable
| Non Playable	
| See Alliance: Order 	
| TBD
| 1

|-
| [[Idoneth Deepkin]]	
| Non Playable	
| Non Playable
| Non Playable	
| See Alliance: Order 	
| TBD
| 1

|-
| [[Kharadron Overlords]]	
| Non Playable	
| Non Playable
| Non Playable	
| See Alliance: Order 	
| TBD
| 1

|-
| [[Lumineth Realm-Lords]]

| Non Playable	
| Non Playable
| Non Playable	
| See Alliance: Order 	
| TBD
| 1

|-
| [[Sylvaneth]]	
| Non Playable	
| Non Playable
| Partially Playable	
| See Alliance: Order 	
| TBD
| 1

|-
| [[Flesh-Eater Courts]]	
| Non Playable	
| Non Playable
| Non Playable	
| See Alliance: Death	
| TBD
| 1

|-
| [[Nighthaunt]]	
| Non Playable	
| Non Playable
| Non Playable	
| See Alliance: Death	
| TBD
| 1

|-
| [[Ossiarch Bonereapers]]	
| Non Playable	
| Non Playable
| Non Playable	
| See Alliance: Death	
| TBD
| 1

|-
| [[Sons of Behemat]]	
| Non Playable	
| Non Playable
| Non Playable	
| See Alliance: Destruction
| TBD
| 1

|}

==Some details==
*Age of Sigmar did a lot of renaming to old factions, as well as mix and match certain armies to fit the new lore. Thus, it's important to check the alliances to see if WHFB units have rules in AoS and in which faction.
**Cities of Sigmar is where pretty much all the Empire models (and High & Dark elves, and regular Dwarfs, and whatever survived from Bretonnia...) ended up. It's a collage of old armies on the side of Order all together.
**Chaos Daemons is divided into multiple battletomes in AoS: Blades of Khorne, Disciples of Tzeentch, Maggotkin of Nurgle and Hedonites of Slaanesh.
**Most of the Warriors of Chaos are now either in the Slaves to Darkness faction or in other one of the Chaos Alliance.
**Chaos Dwarfs are now the Legion of Azgorh.
**The Beastmen are now the Beasts Of Chaos who also took the Dragon Ogres, renamed Dragon Ogors, from the Chaos Warriors list.
**The old Orcs and Goblins are now multiple armies of Destruction, such as the Gloomspite Gitz, Bonesplitters, Ironjaws...
**The old skeleton warriors and vampires from the Vampire Counts are in one of the many armies of the Death Alliance.
*The Chaos Daemons in general are the most versatile faction of all, since they can be played in all settings. In contrast, almost all 40k armies (and some of the AoS ones) are only playable in their own setting. The division between the sci-fi 40k and the low/high fantasy makes this inevitable, though the shared realm of Chaos makes Chaos armies able to share certain units.
*At the opposite end of the spectrum, 40k has the most squatted armies with one army no longer being playable in its setting in any way (the squats, obviously). Though, if you look at it from a transition perspective, AoS squatted both Bretonnia and the Tomb Kings in its move from WHFB, so you make the call. 
**Apparently, as of April 2022, the Squats are coming back under the name Leagues of Votann. We'll wait and see how this plays out.
**While Bretonnia and the Tomb Kings "''technically''" have rules for AoS, they were pretty much there as a quick "Warscroll Compendium" to give their player some solace for the transition, which won't get any updates ever, so they are ''de facto'' squatted in AoS, and there's little to no hope to see them in Age of Sigmar 2nd Edition. Still, until then, they can be played with official rules, so they count as playable.
*The Adeptus Mechanicus used to be divided into two factions, the Skitarii and the Cult Mechanicus, but since that divide was solved in 8th Ed. (and let's face it, there was no reason to keep them separate), they count as a single faction on the list. 
*Likewise, the Imperial Agents used to include Sororitas, Inquisitors, Astra Telepathica, the Assassinorum... but since they all had their own armies separately afterwards, they are counted as such.
*Solar Auxilia have the unique spot of only being available on HH and not on 40k, understandably so due to the lore. You can get round this by playing the as a custom Imperial Guard regiment in 40k as they share a lot of equipment and are still mainly humans with Lasguns, but since they have no official rules for them in 40k they are not included on the list.
*In a somewhat similar spot to the Solar Auxilia, Cathay has been confirmed for The Old World and is the only faction so far that has no (public) rules for Warhammer Fantasy making it the only "Fantasy" army with no backwards compatibility with older editions of Fantasy. It may see rules for Age of Sigmar, likely to add variety to Cities of Sigmar or maybe to expand those dragons Sigmar is friends with, but for now it is only confirmed to be playable in The Old World.
*It should be noted that the old Realms of Chaos supplements actually encouraged battles between Chaos Fantasy and 40k armies (and others to a lesser extent).
*If you are feeling particularly talented you can attempt to kitbash CoS/IG into looking Steam-punk like, since both universes have civilizations which are more or less in the same upper/lower (respectively speaking) technological level, having a heavy emphasis in ranged weaponry and weapons teams, really, we wish GeeDubs could give us a supplement to use CoS models into 40k or something, same with Chaos Cultists and what not, [[Awesome|maybe multi-option kits?]]

[[Category:Warhammer Fantasy]]
[[Category:Age of Sigmar]]
[[Category:Warhammer 40,000]]
[[Category:Games Workshop]]