Since Hal had witnessed the Toxic Viper's ability to imbue itself with its own poisonous gas, he had found it curious.
Why?
It was simple,
Most demonic beasts are in tune with an element and their control over it increases along with their realms of cultivation, however, the Toxic Viper's went a step further.
Its secret art was innate and seemed to have nothing to do with cosmic energy.
It felt more like a Bloodline!
And an ancient one at that.
And so Hal purchased every information available to him about the Toxic Viper from Grimoire and it convinced him beyond all reasonable doubt that the Viper had not simply evolved from a simple wild beast.
It was born (or hatched) that way.
How then did it arrive here?
It did not simply appear here. All Demon beast in Tretch forest evolved from simple wild beasts. A beast with a link to an ancient bloodline was suspicious at best.