Adds come in a random / any order at health %. the first wave begins on ANY damage received so pull her with a bard and try to pre-slow. FADE dose not drop her aggro but it dose drop her elemental adds. Pull her outside of the back of the castle. Xegony is a ranged only fight you dont want to get the DOT on you. Keep your tank cured.
Once she's in camp you will have to deal with adds immediately make sure to be watching north / south and pull them to your designated kill area for adds.
Xegony needs a 3second ch rotation with out defensive on a standard era tank (10khp)
Tank swap is a good idea to maintain aggro if main tank dies. (you don't want her at the main ch chain area.)
I like to pull and set her up behind her castle on the wall, make sure your ch chain cant be hit by the aoe by range (ceramic sword of war) is a good era extended ranged item.