Raids are given as a reward for achieving guild levels and are intended as a training ground for new raiders. Each raid is Group x2, and will scale according to the higest level character in your raid. In order to advance to the second raid, you must complete the first. To get to the third, you must complete the second, etc. After completing all five new raids, you will be able to do them in any order. Not all members in the raid need be of the same guild.