From Emil Chronicle Wiki

Hell King is a level 68 monster.

[edit] Stats

Basic	Combat
Level 68 Experience 39,000 Job Experience 16,000 HP 360,000 SP 500 MP 500 Behavior  ???	Type Animal Boss Skill A.SPD 3.60 ATK 395 - 480 DEF 200 C.SPD 3.60 M.ATK 350 - 360 M.DEF 200
Properties Dark(80%) Item Drops Silver Medal, Dominion Shaggy cut Recommendation, Tiny Rainbow Medal, Wolf Ears, Catty Booster, Hell King Stamp Skills  ??? Location Some Instance Dungeon