Very hard riddle that i can't finish

This is a very hard riddle that I can't solve and i would need some help with it.

It goes like this

Forever in the FORTRESS and never to LEAVE,
Lies a dark SECRET; how shadows DECEIVE.
Do not be STRAYED by those in AUTHORITY.
Do not ask WHO or WHERE, let's get some CLARITY.
The question is WHY but it's not your CONCERN,
If the answer, without sacrifice, you wish to learn.

There is Sect of the Wolf mentioned aswell as Judges and Sect of Assassins