In the world, places where poisonous creatures such as snakes and insects thrive are mostly found in tropical regions, especially those hot and humid rainforest areas. In temperate regions, the toxicity of these creatures is generally not very strong.
However, the Shushan World is quite different, and the most formidable Poison Dragons reside in the bitterly cold depths of the North Sea.
Divine Dragon Island is located at the end of the Mountain and Sea Dragon Veins, where the negativity of the two northeastern seas originates. The island naturally breeds a large number of snakes and insects, particularly a wide variety of Poisonous Snakes, hence it's named Snake Island.
Originally, Sect Hierarch Hong relied on spells he learned from Shi Longgu, especially her Flying Needle technique, which was specifically designed to counter various snakes and insects.