Fortunately, Unfortunately

After Loki goes missing from Asgardian prisons, Thor leaves Asgard to look for him, ignoring Odin's insistence and threats not to do so. Odin, desperate, decides to resort to drastic measures to force his heir back to Asgard. As in, pulling Hela out of Helheim, turning her mortal, and sending her after Thor drastic. (Gen, No smut)