Vassal of Bahamut

[Nifft]

You buying potions, paying for spellcasting, etc = you doing it alone. those things are gear. you're using the resources allocated to someone of your level. people aren't just giving you free stuff, or else you could just have a wizard kill the dragon for you while you stood in the corner and made paninis.

Hmm, so what about the Leadership feat?

Are you doing it "alone" if you've paid a mechanical slot for an ally?

(I guess Familiars would also follow that ruling, whichever way it goes, but most Lawful Good full-BAB classes don't get one.)