Vernix
Vernix is the King of the Green Goblins. He can be found in the Green Goblin Encampment north west of the Underworld . He gives the Untangling the Web and Green with Envy quests in which you need to slay 12 Acid Slugs first to get an Acid Popper and then obtain 1 Eye of Navrey Night-Eyes from Navrey Night-Eyes to get a large bag of treasure.