The Fiend patron is the archetypal warlock subclass in Dungeons & Dragons Fifth Edition. A Fiend warlock has made a pact with a being from the Lower Planes, some of the most evil creatures in the D&D multiverse, in exchange for magical power. The result is a surprisingly damaging and durable spellcaster who brings the power of the Nine Hells or the Abyss to a fight.
Source：https://www.cbr.com/dnd-fiend-warlock-best-build/
