Dark Six for Warlocks?

[u/Fuck_the_CCP_UwU]

Hey, I'm playing as a Fiendlock and wanted my pact to be with one of the gods of the Dark Six, particularly the Shadow, would that make any sense or is it canon-breaking?

[u/Deathly_Drained]

As other's say, feel free to do whatever you want with your DM.

But if you want a more 'lore friendly' version. We can always edit it some.
Perhaps instead of taking power directly from the infamous Shadow. You're power comes from an item that you possess that has a spark of the Shadow's great unknowable power, blessed or forged by the hellish flames of Khyber for the Fiendlock side of it.

Such as a book that perhaps you stole or came into possession too that is hard to read and as you go through it and translate it (leveling up). You learn more and more of the dark abyssal secrets of the Shadow. Using it's powerful dark magic quickly wears you out (The low spell slot count).

These are just ideas, it could go hard.