On this page of the Valheim guide, you will learn how to get a Dragon egg and what you can use it for.
The Dragon egg is one of the items that can be found while exploring the vast world of Valheim. Due to their enormous size, Dragon eggs weigh 200 units each and cannot be teleported. They are used to summon one of the bosses in Valheim - Moder.
Dragon eggs can be found in the Mountains biome - they are in nests. Drakes can usually be found around the nests, so you must be prepared for a possible fight with these creatures.