To get a wvyern egg find an egg carry your friend and make him/her store there items so when they pick up the egg drop your friend in the desert let the wvyern kill your friend then go back and take the egg from his/her inventory to hatch the eggs make a circle of airconditioners or torches
I got a level 150 lightning egg and I was so excited to hatch the egg...that when I went to put the egg down I accidentally ate it instead. :( ps4 users: R2 ISN'T GONNA DROP THE EGG YOU'RE GONNA EAT IT LIKE ANY OTHER EGG. REMEMBER THIS. LOGIC BEFORE EXCITMENT.