The list for the variant abilities is long and some of them are great. I am confused as to what I am giving up from the core Tiefling if I choose a variant ability.
Say I wanted small size or the telepathy which of the main features would I be giving up?
Apologize if this is obvious and I am just missing it.
Assuming you're referring to the variant tiefling abilities in The Bastards of Erebus, they all replace the darkness spell-like ability.