Beldora says you would need to find the Eye of the All-Father first, an ancient giant temple in the Spine of the World mountains. The oracle there could tell you where Hekaton is. But the temple has been sealed for centuries. She suggests finding Harshnag, the friendly frost giant you heard about from Felgolos. He is said to know the location and how to enter. Sheriff Southwell rewards you each with two hundred gold for saving the town and gives you cold weather gear.