Nest

The Nest is a super-organism consisting of untold billions of techno-organic spiders the size of a small child but capable of merging into colossal constructs in order to literally sweep over entire worlds and strip them of natural resources and technology - leaving behind a barren wasteland devoid of life.

The Nest are a vicious species driven mostly by the instinctual desire to breed, eat and spread - however they are also capable of higher-functioning thought and will ally with other species or individuals if they believe they will aid them in capturing a new world or other suitable target.