Given the way Ch. 6 ended, I think the MC is reaching out to Medb sooner than later for help with Jess's magical coma.I'm hopeful that we will soon see the MC and Medb find a way/reason to spend time together (like the MC getting a lead to try to stop the Alfar/Templar war from escalating).
Everything points to fire magic in the end scene so as for my guess? I think there might be a little bit of Queen Titania in the MC's family tree.