According to most people, chaos is the biggest threat in the 40st millennium but what about nids and necrons? Does chaos have any power over them? I know that Tyranids have a place in the warp but I don't know about necrons relations to it.
The imperiums navy at some point will have to gather their forces for the biggest show down in history. To defeat the Tyranids you would have to do it in the void of space. Use warp traps to suck them into the warp with no protection,stuff like that. Planet warfare with them is meaningless unless its some kind of strategic planet that must not fall for some reason. But who knows,they may be the front of a horde that defies the senses.
No body’s mentioned ORKS yet
Orkized Genestealers with necrodermis carapace and worships Khorne
Imperium of man kills xeno heritrics their own citizens are killed in mass maybe for good reasons but still biggest threat to all even themselves