Serpents' Bane

Description
Defeated a drake, wyrm, and wyvern.

How to Obtain
In order to obtain this achievement/trophy you must slay all of the lesser Dragonkin. The Drake, the Wyrm and the Wyvern. The Drake may be slain during the main game, but the final two are only available during Post-Game. See their repsective pages on where to find them.