Tiefling

A pact with the demonic or a tainted bloodline can both lead to the birth of a being known as a Tiefling. Wildly varying in appearance, Tieflings all have something demonic in their appearance, a mark, a mutation that marks their infernal blood. Horns and other animal features are common, though in some bloodlines, notably those of Andromalius and Gremory, the marks are subtle; an intricate tattoowork criss-crossing the body, an unnatural eye colour that glows in the dark, a forked tongue. It is much harder to notice these ones, except for the uncanny feeling you get in their presence, some animal instinct warning you of their abnormal nature. All in all, the demonic are by their nature multifarious, never leaning into any one commonality. Nevertheless, these beings should not be condemned outright for their nature; it is completely possible for these social outcasts to do good. I am living proof of that. However, it is good to be vary with these kinds of things. Their demonic blood often drives these people on a dark path, if their status as outcasts and monsters doesn't do it first. I will follow up this treatise with brief explanations of the four demon lords that most commonly spawn Tieflings.

-Chemardale, The Red Prince

Tiefling:
ASI: +3 Con ,-2 Cha
Age: Tieflings mature at the same rate as humans, but cease aging immediately after.
Alignment: Usually Evil.
Size: Tieflings vary greatly in size and build, 4-7 feet tall. Size is Small/Medium.
Speed: 30
Darkvision: Perfect Darkvision.
Hellish Resistance: You are resistant to fire damage.
Languages: infernal, local common+1 language of your choice.
Type: Fiend.