Hiss is a quest giver in Might and Magic VIII: Day of the Destroyer. He can be found in his home in Blood Drop, and gives the party the Bring the Idol of the Snake quest.
He says he has found an ancient spell that can send the volcano outside the Dagger Wound Islands back into the sea, but he needs the Idol of the Snake to complete the spell. He wants the party to enter the abandoned temple and retrieve the idol.