To tame a Wyvern, steal an egg from a nest using a fast, high-stamina flyer or another agile mount, then escape the trench and incubate the egg in a sufficiently warm area. Raise the hatchling by feeding it Wyvern Milk obtained from subdued female Wyverns, while following its imprinting requests; healing creatures can provide an alternative way to keep it alive when milk is unavailable.