Greetings Demonskull!
It is a key! From the area where you got the crystal return as if you are going back to the broken stairs. Just prior to the broken stairs there is a room with exits in all four directions. One is a door which is closed. If you examine the door frame you will see an impression which is the same shape as your crystal! Ah ha! You know the rest! Have fun with the mummy!
Wyv
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