End Plane

The climates and nature the Enderians originate from can vary but leans towards very cold temperatures. Much of the locations they inhabit tend to be solitary from most other life. 

Wo instead of being invasive within the current world, they bring life to places where it can be seen as near impossible. 

Altering a lot of areas they inhibit, by quite a significant amount. This can make it feel alien when you remember just leaving a normal civilization. (Normal is a base of perception, take that as you will)