Thanks Raze; it turns out that the imp in question was NOT the one you scry for, far from that, the succubus held him prisoner. Only after the succubus is dead does the prison (the left hand side of the hall with the gong in it) open, only then you can talk to him and get the telporter stones back.
Ah well, at least that worked - now for the council members - I've had to back track a bit, so I only have Zandalor at the moment(but that will change).
Last edited by Palimpsests; 14/02/09 11:17 PM.