When Warmind first released, the first five pieces of EP armor you earned came in a set order, ensuring that you'd get a full set. After this, which armor piece dropped was random. However, now that Armor 2.0 is out, this system is still in place, meaning that if you played Warmind prior to Armor 2.0, it's going to be extremely difficult to get a full set of EP armor. The rollout of Armor 2.0 was somewhat messy in general, but this is especially frustrating, since it's effectively punishing people who played the game beforehand. There's a similar situation with Black Armory armor, which had the same knockout system.