The Gatecaller's Key

Steps

 * 1) Kill Captive Coin Labourer at  in the Clefts of Rujark to get a fancy steel key.
 * 2) Examine that key to get the quest The Key of Coins if you do not have finished the quest already.
 * 3) Open the door at  to finish The Key of Coins
 * 4) Open the chest at

Rewards
(may be arbitrary)
 * At least
 * 4
 * 4