That realm is new to the ascended plane. The Ascended Council grants limited protection to realms less than 60 eons (days in worldly time) old...This includes use of the Ascended Superweapon, and direct Ascended Being attacks, on them....
But if you assasult someone successfully you get the message
Both parties are exhausted, these battles being very taxing on ones being. While the battle is now over, it is also not finished. It has will finish in 4 real hours (or 4 eons ingame time). Yes - linear time is one of the things that are left behind in the ascended planes.
Not exactly a bug but still an odd thing.
