Swarm of Ravens

The shamani tosses a hand full of raven feathers in the direction of the target. The feathers transform into a flock of ravens that harrass/attack the target for 1 round plus 1 round for every level of the shamani. The target takes only 1 point of non-magical damage a round from the ravens but must make a DC 14 CON save before casting any spells. Also, if cast upon the firer of a missile weapon the subject must make any attack rolls at disadvantage.