Giant Smithhammer Quest/Spoiler

Method

 * Go to the Cyclops/Minotaur camp in the Plains of Havoc, and be prepared to face many cyclopses and various types of minotaurs.
 * Go down the stairs in the north structure (here). Once you go down these stairs, you will be faced with numerous cyclopses, minotaurs, minotaur guards, minotaur mages, and even some orcs.
 * The quest box is located in the room directly to the south.