The ranged path key is used in the Smoking Kills quest. It is obtained after killing the Mummy warrior on the west side of the tombs. When used to unlock the door to reach the lever to deactivate the traps on the west side, the message, "The door unlocks as you insert the skull-design key." appears in the player's chatbox.
The Magic path key is the complimentary key for the east side of the tombs.