From Emil Chronicle Wiki

Lesser Ghost is a level 40 monster.

[edit] Stats

Basic	Combat
Level 40 Experience 280 Job Experience 320 HP 1,500 SP 200 MP 200 Behavior Passive	Type Magic Creature A.SPD 3.00 ATK 140 - 180 DEF 90 C.SPD 3.50 M.ATK 290 - 480 M.DEF 0
Properties Dark(80%) Item Drops Spirit Dust, Gas Balloon, High Magic Candy, Copper Medal Skills  ??? Location Undead Castle