Tips for advance player to get wyvern milk : In official server, you can net gun Wyvern, and then to KO it, use Mantis with high damage stats (253 damage on incubator so baby born with 1,6K damage, I usually pump until Mantis has 2K damage) and then put wooden club to Mantis (ascendant grade would be better), hit wyvern with Mantis + club and wyvern will KO with just few hits. Grab the milk and kill it with your Mantis while it still unconscious.

More Wyvern Taming & KO Tips