Hard
Using this method increases the difficulty of the third part of the quest. Wield your Black dagger and head out of the shimmering field. Head up the cliff and take the Blue hat. Attack Viyeldi, level 79, and kill him. When you attack him, you will one-hit him to death with your Black dagger without him attacking back. Once you have killed him, your Dark dagger will begin to glow. Now go back down the cliff and through the shimmering field. You will now have to fight the demon. On his first attack he will cast magic on you and then use melee. ;;;;Turn on Magic from Protection prayer. Use the Dark dagger on the Echned Zekin. He will use melee for the most part of the battle but occasionally the throws the black dagger at you, hitting you for a very high amount of damage. It is advisable that you keep your Protection from Magic prayer on if you are wearing melee armour.