being able to 1-3 shot your enemy before the Thorns kill you is good, but at higher levels, it starts to get harder to kill them with a few shots, especially the Legend and Mythic monsters. eventually you either end up waiting to hit the monster while Thorns is inactive, or have enough HP healing of any kind to off set your HP loss. since Thorns takes 10% of your current HP, the harder it is to keep the HP full with Healing abilities the higher your HP is. my Wizard has around 10k HP, with Harmony and Equivalence, with 500 HP on Hit and 250 MP on Hit. I barely notice Thorns anymore, but I wonder if I had 2x to 4x more HP, if my HP would go down more and then stabilize. at one time, I had 500 MP on Hit and 250 HP on Hit. my HP went down to about 25%, and then stayed there. my healing was the same as the damage from Thorns at the 25% HP mark. but at the time, that 25% HP freaked me out , so I switched my HP & MP on Hit.