Devil's Bargain

if you are a Tiefling you gain the following benefits

you have signed a contract with a devil of CR 13 or higher and purge the leftover humanity from your body becoming mush more devil-like. you also gain some of its property's

you gain a flying speed equal to your movement speed as you sprout wing's from your back

your fire resistance gets upgraded to fire immunity

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If you are any thing else you instead gain the following.

30ft flying speed

Fire resistance

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Editors note: your DM may add or remove some of these attributes based on what CR and devil you sing the contract with.