The Mask of Anubis

Story
 Legend has it, when worn by the High Priest of Anubis at the funerals of pharaohs the mask will weep tears of gold. The real Mask of Anubis is possibly located at the end of the tunnels.  

Protection
When the Frobisher Smythes have stolen The Mask of Anubis along with The Cup of Life and possibly the Book of Isis from Egypt they hid The Mask of Anubis most likely at the end of the tunnel's under the house. And the end of the tunnel's is protected by such things

as swinging pendulums, tunnels of fear, deadly Egyptian hopscotch and many other various traps.

Mark of Anubis
Senkhara the Forgotten Ruler of Egypt spirt who is stalking Sibuna gave them all the Mark of Anubis as a curse and in return to reverse the curse Sibuna must find the Mask of Anubis at the end of the tunnels. She is always watching them when theyre in the tunnels looking for the Mask and once "fake-pushed" Nina down the chasm in her dream to get her to hurry up.

The Replica
The replica of the Mask has mainly no detail being pure bronze except for a small circle on the center of the top which is red. Louisa : Sarah's mother made the replica, which Nina thinks if she made the replica she must've seen the original at some point.