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Valgrueo Wyvern locations;

Ice wyvern: North in the Snow Desert, look for a big crack to the north-west, I suggest riding on something fast, another wyvern or argy, ptera may work

Fire wyvern: North in the Snow desert, once you find the Ice Wyverns follow the lava into the cave containing the fire wyverns, also the Artifact of the Skylord will be there, it's really hot down there bring ghille or something

More Wyvern Encountering Tips