Keti is a weaponsmith. He will offer you his services once you have obtained the title "Slayer of Giants" in the Norn Title Track. If you give him the required amount of crafting materials, and pay him a fee in gold, he will craft you one of the weapons from his "menu". Also, for a fee of 10 gold he can customize a weapon for you. This will increase its damage by 20%, but means that no character other than the one it is customized for can use that weapon (or your heroes). All weapons crafted by Keti are blue, requirement 9 and without any inscriptions.