A potent type of azi dragon known as a sruvara, Niasvorias of the Double Death is quite possibly the most poisonous creature on the face of Golarion. Niasvorias is said to have two fangs—one green, one white. The green fang's venom can kill any living creature instantly while the white fang's venom is so deadly that it can even kill the dead, slaying undead instantly (which should be impossible). It is said that if one can find Niasvorias as he slithers through the southwestern reaches of the Zho Mountains, one can negotiate to buy his famous poison, but the price is incredibly high: a single life for each drop of poison.