There was the rusting, iron face and there lay the sword. Even with its hilt emblem smashed, it was beautiful. He touched it almost reverently and snatched back his hand with a gasp. The blade might still be hot, but the hilt was so cold that it almost burned his hand.
– Graykin's narration, Dark of the Moon, "Chapter 13: Converging Paths"
Kin-Slayer is the Knorth heirloom sword. It works together with the Knorth heirloom signet ring to enhance the strength of its rightful wielder.
↑Dark of the Moon, "Chapter 5: Under Green Leaves" — "There were many strange stories about this sword, including a tradition that it enhanced the strength of its rightful wielder;"
↑Dark of the Moon, "Chapter 15: The Killing Ground" — "She swung the sword. The blade sheared through its wrappings, through the Waster's boiled leather armor, halfway through his body. […] Her right hand, wearing the ring, gripping the sword, tingled as if it had been asleep. So at least one of the stories about Kin-Slayer was true."
↑Dark of the Moon, "Chapter 4: First Blood" — "He brought Kin-Slayer whistling down. […] Ganth's sword sheered through armor into the changer's flesh. The wound closed around the blade and blood burned it away. Keral rose, laughing. 'Poor Ganth. Can't trust anything, can you?' The Gray Lord stared at what was left of Kin-Slayer."
↑ 4.04.1Dark of the Moon, "Chapter 13: Converging Paths" — " 'Graykin, up those stairs over there, left around the corner and down the hall, there's a room with a furnace in the shape of a huge iron face. On an anvil in front of it is Kin-Slayer, the Knorth heirloom sword, reforged. Take that to the Highlord and… and tell him his sister Jame sends it.' "
↑Dark of the Moon, "Chapter 15: The Killing Ground"