* Hitpoints: Wyverns have 200 hitpoints which are pretty high for their level, so you might take a while killing them.  * Stab defense: They have 140+ stab defense, so try to avoid using this.  * Slash and crush defense: Their slash and crush defense are only 90, so when using a melee attack on that style, it is going to be a lot more effective.  * Magic defense: They only have 80 magic defense. While this is still pretty high, it could be a viable option to train your magic on.  * Ranging defense: Skeletal wyverns have +140 ranging defense, so yes ranging is going to be quite slow, but due to the many ranging options you have, and the good gear there is for range, you might do pretty well here. Of course, you need a decent-ranging level.