From Emil Chronicle Wiki

Killer Beast is a level 37 monster.

[edit] Stats

Basic	Combat
Level 37 Experience 300 Job Experience 300 HP 550 SP 999 MP 999 Behavior Aggressive	Type Animal A.SPD 3.56 ATK 142 - 161 DEF 100 C.SPD 4.00 M.ATK 140 - 156 M.DEF 20
Properties Earth(20%) Item Drops Leather, Fur, Torn Magic Book, Luxury Leather, Velvet, Killer Beast Stamp Skills  ??? Location Island of the Undead, Dead Mine