Well if we're just throwing concepts out there that we would like to see, I wouldn't mind seeing a purely organic alien species that can strip a entire planet of life in a matter of months, not unlike the Tyranids of WH40K.
Reapers got nothing on them
Tyranid Planetary Assimilation:
Day 00 Initial mycetic spores are dropped, generally containing Lictors or Genestealers. Infiltration force led by a synapse creature of some kind; reproduction of Tyranid creatures likely begins immediately.
Day 09 By day 9, Tyranids will have expand to around 200 km from the drop point, and will likely present a significant threat to planetary defense and resident Imperial Guard forces.
Day 13 Tyranids will have expand to 700 km from the drop point; may begin infesting local water sources.
Day 37 Tyranids control area within 2000 km radius of the drop point; basolithic infestation to 5000 km radius.
Day 48 Tyranid population growth skyrockets, with population doubling approximately every 2.5 days.
Day 50 Main Hive Fleet arrives, craft generally number around 1.5 billion. Psychic contact with planet is cut off by the shadow of the Hive Mind. Any attempts to escape are quickly stopped by the Hive Fleet.
Day 51 Primary consumption of bio-mass begins (resistance has generally been eliminated by day 51). Brood ships land, releasing Ripper swears, which consume all remaining organic material and deposit them at the reclamation pools. Capillary Towers (and the Brood ships) send the material into orbit.
Day 80 The hive ships descend into the upper atmosphere and begin collecting it. Reduction in atmospheric pressure causes oceans to boil away, which are also collected. Lack of oceans causes plate tectonic shifts, dramatically increasing volcanic activity. Upon completion, the Hive Fleet moves out of the system in search of fresh prey.
Day 100 The Imperial Navy arrives in respond to the distress call to find the world lifeless.
This sounds very similar to The Flood though...
It would also strain credulity that an alien parasitic species could assimilate biomass from diverse alien species that may utilize completely different biochemistry.
But I do like the idea of a rapidly reproducing alien species that can survive in diverse environments. Something like that could be expected to swarm across the galaxy like a plague. Like the Rachni did, or the Krogan. The mathematics of population growth and limited resources demands it. When it happens on a galactic scale, some interesting moral choices could be involved. It would be an interesting perspective too - such species aren't evil, they are just doing what their biology forces them to.





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