You were born under the Birthsign of the Serpent and gain the Serpent power.
Serpent. The power of the serpent can protect you from destruction or allow you to bring destruction to others. Once each day, you can use the power to create one of the following effects:
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As an action, you cure yourself from one non-magical disease, poison, or magical effect.
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As an action, you touch a creature and infect them with a slow but potent poison, You instantly deal 1d4 poison damage, and an additional 1d4 poison damage at the start of each turn for the next minute. This damage ignores resistance. This damage increases by 1d4 when you reach 5th level (2d4). 11th level (3d4), and 17th level (4d4).