
For some reason, Fraps keeps stopping recording when I'm about to kill the Wyvern, but you get the basic point of this technique. You get a few Souls of Flight and a gold coin from killing it. Souls of Flight are required for Angel/Devil Wings (they're a huge help). All you need is any flail (although I recommend the Dao of Pow), wings/rocket boots/red balloon/cloud in a bottle, and it's recommended to be in space (you can kill him easier). If you're skilled enough, you may not even get hit by the Wyvern! Jump up when the Wyvern speeds at you, making sure to not get hit, then attack right into the body, hitting as much of the Wyvern as you can with your flail. Aim into the front of the Wyvern into it's body, not the side. If you attack it's side, you'll do around 100 damage with the Dao of Pow. Hitting it head-on will do something like 600-800 damage with the Dao of Pow, if you aim good. Repeat until the bastard's dead, then collect your findings. NOTE: You can use any weapon that can hit infinite amounts of enemies with one shot, and moves in the direction of your mouse. For example, Jester's Arrows work, or a Magical Harp. These are probably better, since you can shoot multiple projectiles in faster intervals than the flail. However, a flail is easier to get, and doesn't use ammo. Jester's Arrows are rather difficult to get, so it's not recommended that you use them regularly.
terraria
wyvern
dao
of
pow
flail