[5E] Wizards, Sorcerers, Warlocks & Eldritch Knights

[RobJN]

For those of you running Blackmoor in 5E, how do you handle the various Arcane casters?

Spell Focus crystals seems very easy to integrate into 5E.

See also: Dragonstones

WARLOCKS

Possible patrons:
Fey: Various entities from the Ephemeral Plane. I'm sure RobJN has more ideas here
Fiend: Spawn of the Evil Gods like Thanatos, Volketh, Calelrin etc would be interested here.
Great Old One: Egg of Coot

Any of the Winter or Summer Kings, Queens, or High Lords, I think, are of sufficient power to grant mortals gleamings of Their Own magic. Fey of slightly-lesser nobility might be able to grant such boons within their own domains, but probably would not stretch across the Veil.

Let's not forget Stodos (Cryonax), and Zug-zul for demonic patrons.