Brisingr

When cast, you must place the lump of charcoal on the ground by your feet and set it alight, chanting 'Brisingr' whilst doing so. When you have lit it, you have 2 mins before the spell ends. A ring of enchanted fire surrounds you in a 10ft radius ring, those within the ring heal 1HP, even if unconscious, and those who try to get into the ring either have to have permission of the caster or be pushed back 5ft and take a STR saving throw against the spells DC. On a failed save, they take 1d4 fire damage and 1d4 force damage, on success they take half as much damage. For the duration of the spell, nothing can get within the circle except people the caster chooses. At higher levels, anything above 2nd level, you heal an extra 1HP.