From Emil Chronicle Wiki

Sellslay is a level 83 monster.

[edit] Stats

Basic	Combat
Level 83 Experience 2,350 Job Experience 2,500 HP 6,300 SP 113 MP 299 Behavior  ???	Type Rock A.SPD 1.00 ATK 200 - 230 DEF 140 C.SPD 3.50 M.ATK 300 - 350 M.DEF 150
Properties Dark(20%) Item Drops Solid Pebble, Bolt, Torn Magic Book, Urchin Fossil, Orihalcon Skills  ??? Location  ???