Thats what Horde Mode should be (UPDATED)

​https://m.youtube.com/watch?v=ElM74Jv9hLg&pp=ygUgc3BhY2UgbWFyaW5lIDIgYXN0YXJ0ZXMgb3ZlcmhhdWw%3D

Just look at the video and Imagine it transposed to the game.

12 or more players  in an open battlefield map . You can add objectives , facilities control etc.. in a community effort to repel the invasion or conquering planets in different ways : taking back a fortified Imperial fortress ( or taking it as Chaos marines) , open plain battlefields etc..

 Modders have shown us that its perfectly possible to have many more players in an operation with increased enemy waves and Imperial guard support without any performance issues , so It would be perfectly doable.

If you hear us also on the face customization and let us make our own marines there would also be huge advantages because :

1) We could finally get rid of Talasa squad and main story ( or at least it can give you the option to do so in order to make something different )so that :

2)New settings and maps can be created both outside of the current planetary system of the story or in the very same system that doesnt involve Talasa squad, allowing the devs to create different battlefield scenarios that can be put in the story's context ( battles not yet told or the campaign aftermath battles ) So the possibilities can become immense 

4)Thanks to the previous points, new marines units can be created and implemented , for example firstborn marines joining the battle, our characters can be made anew and can level up from being a reclute to become Veterans , unlocking different/advanced perks and different/advanced loadouts combinations as a consequence 

Combine it with this idea 

https://community.focus-entmt.com/focus-entertainment/space-marine-2/ideas/7613-horde-mode-a-community-effort-against-the-enemies-of-the-imperium?page=1#post-7613

And i think would be great 

This would finally grant the feeling of epicness that a 40k game deserves to have . Being protagonists of great large battles in a fashion that only this ip Is capable of and most importantly , what 40k fans always dreamt to have in a game

Hope that at least modders could deliver this experience to us of they are given the map editor from the tool kit