|"There are plenty of eye-witness accounts. Just because you're so narrow-minded you need to have everything shoved under your nose before you–"
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The common adder, also known as common viper is an extremely widespread venomous snake. It is a known kind of conjured snake when someone use Serpensortia.
Behind the scenes
It is funny to note the counter-spells incantation is Vipera Evanesca as the Latin name of the common adder is Vipera berus.