Yamu's Magical Barrier

You draw in the weave around you and shape it into a spherical barrier that surrounds you for the duration which is 1 round plus an additional number of rounds equal to your highest spell slot level (maximum of 10 rounds total). While the spell is active your Armor Class increases by 2 and upon casting the spell you gain temporary hit points equal to your character level. If you have any temporary hit points given to you by this spell left when the spell ends, the temporary hit points vanish.