You can add your proficiency bonus to History checks that involve knowledge about the Nine Hells or the Abyss.
Monstrous Compendium Vol. 1: Spelljammer Creatures
Frozen Sick
D&D Beyond Basic Rules
Basic Rules (2014)
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Secrets of the Succubus
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Posted Dec 19, 2018Honestly, no benefit here. Why not just make the person gain proficiency in History. Expertise in knowledge about Fiend and Undead or something. You have to get it to be worth taking this in multiple situations. not the bare minimum of one