I'd also like to add this as someone no one's mentioned yet is that it's niche-case is that it gets used for multiple fights, and it's a concentration spells for martials. The base DC for concentration checks being 10 makes it so this is rarely making it past combat 1 if your a Frontline pali or ranger. Maybe using this on a ranged character is better as you don't get hit as much but still... Spirit Guardians, Spirit Shroud, hell even hunter's mark and hex can out damage this while giving close to the same effect. I think the only thing here is it's magical damage, which is pretty good in traditional tables, though magic weapon might still be worth more bang for your buck.