Some greedy asshole humans made deals with the demons and devils of the Nine Hells without thinking about how it would screw up their gene pool. Now they ALL look like this.
Tiefling
Abilities
Racial Traits
Darkvision - Racial Trait
Thanks to your 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.
Bloodline of Glasya - Racial Trait
You know the Minor Illusion cantrip. When you reach 3rd level, you can cast the Disguise Self spell once with this trait and regain the ability to do so when you finish a long rest. When you reach 5th level, you can cast the Invisibility 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.
Unorganised
Hellish Resistance - Racial Trait
You have resistance to fire damage.