Hades has a small chance (approx. 8 - 10%) to drop The Overlord. It's the key for one of the Immortal Throne's Easter Eggs, the Secret Passage. Even though he is fought much later in the game than Typhon, Hades is easier to defeat mainly due to his attacks dealing only one type of damage. He also does not spam instant-kill abilties. Recommended resistances: Vitality (at least 50%, though then you would have to be careful), Stun (not required, but might help). Rumor has it Bleeding resistance is useful too, but if it's true, you can ignore it on Normal difficulty.