An undersea guardian box is a monster box containing an Undersea guardian. Making the box will result in the player gaining 104 Monstercrafting xp and releasing it will give 2.7 xp. Making the box requires level 70 Monstercrafting. The box can be created by using 10 Living minerals and 122 Monster fragments on an Empty monster box while wearing a Crafting necklace. After releasing the box in a Player-owned house, the creature will appear and attack the player instantly.