Iznu - Dune Raider Chieftain is a minor boss-monster and part of the Caravan Woes side quest given in Fayum Oasis. He's a Dune Raider hero located in a camp in the Fayum Desert, north of the oasis. Kill him to complete the quest, then return to Pa-neb in Fayum Oasis to get a reward.
Iznu is a hero based on the regular Dune Raider Pillager, a mounted ranged attacker. He has a lot of health, fire-based attacks and skills and also has an aura effect improving nearby monsters. Being a Pillager, he also wears a Dune Raider's Pack armor. Aside from this, he's nothing special.
Aside from being quite durable, there's nothing special about Iznu. Try to clear the surrounding camp area from any Dune Raiders before engaging him makes the fight a lot easier. His attacks and skills (he occasionally casts meteors or throws a fire bomb) deal part fire damage, so you might want to boost fire resistance if you find yourself taking too much damage from him.