Wyvern Eggs require a very high temperature to hatch. Choose a reliable supplier to quicklyBuy ARK Wyvern. A minimum of 15 Campfire will be needed to reach the required temperature. More fires may be required during the night, to accommodate the lower ambient temperature. It takes around 3 days and 20 hours to grow to an adult and they will take Wyvern Milk for imprinting and petting but can be rby Jonser - Issues of Concern, Nationally