Tieflings mature at the same rate as humans but live a few years longer.

Tieflings are about the same size and build as humans. Your size is Medium.

Your base walking speed is 30 feet.

Thanks to your fiendish heritage, you have superior vision in dark and dim conditions. You can see in dim light within 60 feet of you as if it were bright light, and in darkness as if it were dim light. You can’t discern color in darkness, only shades of gray.

You have resistance to fire and poison damage. You also have advantage on saving throws against being poison

You know the acid splash cantrip. When you reach 3rd level, you can cast the detect magic spell as a 2nd-level spell once with this trait and regain the ability to do so when you finish a long rest.Charisma is your spellcasting ability for these spells.

As an action, you can magically teleport, along with any equipment you are wearing or carrying up to a certain distance to an unoccupied space that you can see. Your total class level determines the distance and how many times can you use this trait per long rest, as shown in the Teleport Initiate table. At 2nd level, for example, you can teleport up to a distance of 20 ft once per long rest.

Teleport Initiate table

You can speak telepathically to any creature within 30 feet of you. The creature understands you only if the two of you share a language. You can speak telepathically in this way to one creature at a time.

You can speak, read, and write Common, Abyssal, and Infernal.