((Except not all that much really. All the current Tyranid Hive Fleets are either destroyed or preoccupied right now. Behemoth got smashed at Maccrage; sure they devastated the planet, but the Imperium's on such a massive scale that even the chapter world of the smurfs is replaceable - they recovered, after all. I forget how exactly Kraken died, but IIRC it split into a bunch of tiny fleets that either starved to death in transit between worlds or died whenever they hit any resistance - hell, the frikkin Tau managed to kill a Hive Fleet! And Leviathan got all tied up in fighting the Orks thanks to Kryptmann, which actually isn't the dumb move a lot of people seem to think it was considering that if they really wanted to, the Eldar or a Necron dynasty or someone with access to sun busting tech could go to Octarius and make the sun go supernova, wiping out that particular threat. Even if we do accept the conjecture that the Nids have galaxy sized fleets, that really only equals into several thousand fleets at most. Sure, the Imperium would take heavy losses, but if every other faction stopped attacking them and let them recover for a bit they'd kick the crap out of the bugs from space.
But that's a bit too off topic for me right now.
((And there are trillions more where they came from. It's all just a drop in the bucket. And um...how big of galaxies are you imagining?))
...oh you mean in the quantum cloning sense. That wouldn't make a meaningful difference I think.
((It depends on how fast the clones form. 50 kilograms of biomass, several times a second, makes for an impressive rush.))
((Come to think of it...Scratch the Altered, we need to keep Xan away from Grate.))
((Well now you gave me the idea.
Hell, it could work, though I don't really need it what with the kitchens.))
((Like that makes me feel better. "I don't need an infinite supply of biomass until I get cut off from the kitchens or they run out of food."))
((So, we can infer from that point, the Altered absorb biomass at an incredible rate, something the Tyranids cannot do. The Altered could literally just absorb them on the run, as in, suck them in like some giant fleshy vacuum cleaner. Out evolve that suckers!))
((One of the Tyranids' secondary schticks is copying the tricks of their enemies. Drop a lump of Altered flesh into one of their digester pods, and they'll start making Tyranids that have the same quick-biomass-absorbing properties as the Altered, plus the Tyranids' other tricks.))
((Which makes me wonder...who would fare worse if the UVM and the Imperium had a number of portals connecting the two universes?))