multiple questions, here’s some context: in a home game (custom setting), there’s a royal family with a strong tendency for sorcery. Wizard player wants to test the blood’s magical potency in terms of granting powers to non-members, similar to hoe dragons make pacts./ . That's totally up to you, if it's a custom setting. I'm only an expert on the Realms (and can talk a little about other settings I've worked in, like Amber and Middle-Earth and Golarion). Is this home game D&D? Many FRPs treat "sorcerers" differently than D&D does.

— Ed Greenwood (@TheEdVerse) March 31, 2019