Wish we could choose what fiend our Fiendlocks answers to, Fiend is a vague term that fits both Devils and Demons under an umbrella,
"Fiends powerful enough to forge a pact include demon lords such as Demogorgon, Orcus, Fraz'Urb-luu, and Baphomet; archdevils such as Asmodeus, Dispater, Mephistopheles, and Belial; pit fiends and balors that are especially mighty; and ultroloths and other lords of the yugoloths."
If I was a warlock personally I would rather have a Succubus patron who is more than willing to have my first born child than some dude in a goatee asking for my soul but that's just me.
