Energy Barrier

You create a barrier of humming energy that is both indestructible and damaging to pass through. You may shape this barrier, which fills space in any variation up to 15 ft. high and 60 ft. wide; in all cases the barrier is 1 ft. deep. Objects and creatures can pass through freely but must take damage equal to twice your level when doing so. Spells that don’t require line of sight may pass through, although areas of effects created by spells cannot. 

The barrier takes the appearance of an opaque, dark purple sheet of magic that emits dim light to 15 ft., and the damage type it deals is arcane. 

This spell requires a large carnelian (150 g.p.) gemstone to cast, which is consumed.