Try breeding an argent and get an imprinting bonus as high as you can, for use to lure wyverns into a trap, the imprinting bonus will grealty increase survivability of your Argent. Also go for low level poison female wyverns whenever possible.
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.