This forum is to be used for all discussions pertaining to Obsidian Entertainment's Neverwinter Nights 2, the Mask of the Betrayer expansion pack, the Storm of Zehir expansion pack, and the Mysteries of Westgate adventure pack.
In The Githyanki Base In Act I, when you get it from Mephasm, you can use it on the "portals" surrounding Zeeaire, or (as I did), you can just break them I'm not familiar with any other use of the sphere.