Thorns dont amount to much unless youre into big-time masochism. Imagine your pally actually wading into the middle of a dozen or so monsters TO GET HIT! My first pally went to lvl8 thorns and I got tired of him I made another one. Thorns will work only if you ARE getting hit, if you've got good defense thorns is useless. If you plan to use it on PVP that wont work since it only deals 1/10th damage. so find another aura to max out if I were you.