[quote=KabenSaal]
I wonder if I can use my Semblence to make the boomerang hit one of the artefacts and use it as a homing beacon to their location. Would be an amusing cheat. Could even steal all the Artefacts and hide them somewhere.
[/quote]

And then the divine GM fist crashes down on the boomerang, atomizing it forever. So no. You can't.