From Emil Chronicle Wiki

Arsenal Keeper is a level 105 boss monster.

[edit] Stats

Basic	Combat
Level 105 Experience 45000 Job Experience 50000 HP  ??? SP  ??? MP  ??? Behavior Aggressive	Type Magical Creature A.SPD  ??? ATK  ??? DEF  ??? C.SPD  ??? M.ATK  ??? M.DEF  ???
Properties Fire Item Drops Vacuum Pack(Private), Vacuum Pack(Native) Skills Dark Blaze, Gattling Blaze, Gravity Fall Location Into the Ruins Quest