Quote Originally Posted by Kish View Post
Check again. Durkon's not a wizard. If the particular time of day Vampire Durkon prepares spells has passed, then Durkon can have prepared new spells, even if it's only been half an hour. If it hasn't, then Durkon can't have, even if it's been 23 hours.
But he can only exchange spells for spells he hasn't used, such as Thor's might. He cannot gain new spells to replace those he has used until after 8 hours.