The Pet Hatchery is where players can cross breed pets with other players in the game. The resulting egg will hatch after a certain amount of time (depending on the pet) and will contain a mix of traits from each parent. You may only breed a pet once every 24 hours so you best choose your pets wisely so you end up with a desirable pet. You will also require a certain amount of gold ranging 8,000 to 50,000 gold to breed your pet depending on what pets you are planning to breed. Your pet must be at the Adult level in order to breed.There are some sigils that let you breed 2 of your own pets if you so desire.