If you choose to build a breeding barn and a cage out in the desert or near the world scar, always remember to place the barn away from the wyvern cage so it won't agro on you while your inside. And a VERY important tip; Always place your behemoth gate correctly and keep your baby wyverns away from the gate at all costs, as a wild wyvern can breath their specific elemental attack through the gate and damage your babies. I had this problem multiple times but I had my rock elemental as protection so we survived :)

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