Tieflings connected to Dispater get a +1 to Dexterity, while tieflings with a tie to Fierna get a +1 to Wisdom. However, Mordenkainen's Tome of Foes adds nine tiefling subraces, each of which are tied to a different ruler of a layer of hell.Įach subrace has a different ability score increase - while all tieflings still retain a +2 to their charisma skill, some subraces get a secondary +1 increase to a score besides Intelligence. Tieflings are one of the core races in Dungeons & Dragons' Fifth Edition - humans whose ancestors once made a deal with a devil from the Nine Hells.