For people that feel that vanilla biters are too easy and boring, I bring you the ultimate collection of alien adding and tweaking mods. No more ploughing through biters and assuming the base is gone. They'll rebuild from support so you'll have to kill them too. And on, and on, and on. Did I mention that aliens are now (optionally) related to trees?

Features:
Big monsters that are really tough
Smarter biters that hunt in groups
And of course, more biter types

Credit to all respective mod authors for making this modpack possible.

My other mod packs:
https://mods.factorio.com/user/tntmasta