A Sea devil box is a monster box containing a Sea devil. Making the box will result in the player gaining 95 Monstercrafting xp and releasing it will give 2 xp. Making the box requires level 55 Monstercrafting. The box can be created by using a Sea stone and 84 Monster fragments on an Empty monster box while wielding a Crafting necklace. After releasing the box in a Player-owned house a Sea devil will appear and attack the player straight away.