No matter the base race allow tieflings to have outsider background.
Subraces rewards in general:
Have some developed for the underdark setting Full-blooded orcs, bugbears, hobgoblins, and ogres do feel like more of a special reward to me compared to the surface subraces without being to out there especially considering the cities the underdark is based on.
Tieflings
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Re: Tieflings
At least two of those in your list are under very active consideration.
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