And, of course, now I'm thinking what if the monogamy/marriage-contract part of it doesn't actually matter,
that the Fireball/Napalm Spell is really just an STD,
and the key to defeating the Beast is assembling the squad of Colwyn's and/or Lyssa's prior lovers,
and/or transitively back to wherever this power originates
or transitively forward if we have some number of inopportune deaths and [mid-battle] need to fuck out some more Fireball/Napalm Mages to get the job done...
That movie (which I'm guessing will never, ever get made) could conceivably not actually suck if it were done right
(although we're now solidly in HOW THE HELL DOES THIS PLANET/SOCIETY ACTUALLY WORK? territory).
((need more sleep...))