In the level Infiltrate the Octan Tower, if your stuck finding this level first use the portal to go to cloud cuckoo land then down the stairs and to the right fly over to the cloud on the right and slide down the rainbow slide the level is in there.
The relic room is a room with the lasers near the end you will know you are in this room as you enter the lasers are directly in front of you.
This has to be done in Free Play and you must have purchased Ma and Pa Bad Cop and Lord business.
You can only have two people in your party so choose one of the cops ma or pa Kragelize them with lord businesses gun using square and then switch to the other one and do the same.