Minor Spell Immunity

This spell creates a 1-inch-thick green translucent shell around the caster that protects them from the effects of low-level spells, whether they are harmful or beneficial in nature. The caster is immune to the effects of all 1st-level spells and reduces by half (round in favor of the protected creature) the effects of 2nd and 3rd-level spells, both clerical and magical. The caster's own spells are unaffected by the shell and they can at will lower the protection of the shell for 1 round at a time to receive spells from others (like magical healing). At the end of the round, the shell automatically springs back up again.