Gather the four scepter keys

Gather the four scepter keys is a side quest introduced when first entering the Watcher's Keep Elemental Level main portal room.
In terms of classifying this as a "Side quest", the reason for that label is that it is not necessary to complete this quest in order for Gorion's Ward to advance the main story. Watcher's Keep and everything within, pursued, and potentially accomplished is all optional. 
==Aquisition==
The Chromatic Demon initiates dialogue with the party as soon as they step through the portal gate from the Watcher's Keep Altar Level to the Elemental level.
A conversation with the demon occurs, and the player must make dialogue selections to ask questions, and determine what the fiend knows, and why it's in that cage. At some point, regardless of whether the party trusts the demon or not, it is understood that the only way to move forward further into the keep, is to agree to help the demon escape in order for it to provide a means to unlock the portal gate. There is no other way.
The party will eventually remark:
:I will find the scepters. What next?
The demon will reply:
:Gather the scepter keys and place them in the four slots around the cage. Once free, I'll be on my way, and you can go through the gate and take on the Imprisoned One... if you still want to. *chuckle*
At this time the player's Journal registers the side quest:
:Journal entry: Gather the four scepter keys
I have entered into a bargain with a chromatic demon, though I had little choice. I need to gather the four scepter keys to unlock his elemental cage. Only then will he give me access to the level below..
==Gameplay==
The party is unsure how to obtain the scepter keys, nor where they are exactly. 
It's understood that the scepters are somewhere on this keep's level and must be found. Further exploration is the only option to reveal answers and a solution to this quest.
See the walkthrough on the Watcher's Keep Elemental Level page for a step-by-step path to death or glory.
There are only two journal entries in this quest. This laid back and simpler journal entry approach is a feature in the Throne of Bhaal portion of the game, as compared to the previous chapters 1 through 7.