Starting when you choose this origin at 1st level, you gain the ability to start fires with a simple touch. As an action, you can magically ignite a flammable object you touch with your hand—an object such as a torch, a piece of tinder, the hem of drapes, or a piece of cloth.

Wildfire

Also at 1st level, you can start dangerous fires that are able to spread across the ground, burning everything they touch. You learn the create bonfire cantrip, which doesn't count against your number of sorcerer cantrips known.

At the start of each of your turns while maintaining concentration on create bonfire, the fire grows. Choose a space within 5 feet of the flames created by the spell. That space also fills with flames, as if by the create bonfire spell.

When the spell ends, any spaces set on fire by the spell are extinguished.