Well, I've found the column-like piece in the lower levels, received the piece from the warrior shade after putting the other warrior shades to rest, and found the piece in the war room.... anyone mind telling me where the last piece is?

on the way to the astrol thingge u see a guy before u even get there forgot his name but a guy and u have to talk to him and he will tell u a bunch of c^^^ and then u ask for the piece and he wants u to kill those guys upstairs to put them to rest and after u kill all them come back and get it and u have to kill him too

uhh actually the last one you are looking for is in the priest section (where those broken statues are)...the acolyte (forgot her name)will ask you to get rid of the priests etc... on the second level there is a box by the podium its in there. and thx for saying where you got the ones you found were cos i was going mad looking for the one in the war room.