[Source] When Shiltzen took Hafnir in, he did not leave him out in the hills as custom dictated, but instead brought Hafnir up. Though Shiltzen was ugly and strange, and found Hafnir discomforting to look at, he was kind to Hafnir. He taught Hafnir about his past, and tried to 'humanise' Hafnir. He even brought Astrid to the house so that Hafnir could see her, though Shiltzen never told Astrid his reasons or allowed her to catch a glimpse of her brother. For a large part, this seemed to work, but it was obvious that Hafnir had a vicious temper and a weakness for drink, so Shiltzen kept him always penned. For company, Shiltzen sometimes brought the elves to see him, but when Shiltzen's back was turned, the elves were often cruel and taunted Hafnir.