The Arachnoids lived from 5012 A.D. to 6038 P.A.D, also known as The Age of Carnage. They started conquering worlds at about 0651 P.A.D. By 3021 they had conquered most of the known galaxy.
The Arachnoids are 3 feet long versions of arachnids. The king and queen are ten feet long unlike the other arachnoids.