We can learn much from the elder vine, which threatens with barbs the hand that would trim it back.[1]
Thorns is a Balance, Feral, and Restoration druid PvP talent, available at level 35. It applies a buff on a friendly target that causes enemies to take Nature damage when they deal melee damage to the target.
Thorns will act as a buffer against dispels in PvP, giving enemies a chance to dispel your Thorns instead of some more important buff.
Thorns can be useful when being attacked by an enemy that has very low health, as they will often die quickly from the Thorns damage without requiring your attention.
During the Legion alpha, the honor talent was named Razor Thorns.[2]
Patch changes[]
Hotfix (2020-12-01): Fixed an issue where Thorns was not dealing damage to attackers after being melee attacked.
Patch 9.0.1 (2020-10-13): Level requirement changed to 35 (was 40).
Patch 8.1.5 (2019-03-12): Mana cost increased by 50%.
Patch 4.0.3a (2010-11-23): Beginner tooltip revised to no longer imply the spell could be kept up at all times. In addition, Thorns damage has been reduced by 60%.
Patch 4.0.1 (2010-10-12): Duration reduced from 10 minutes to 20 seconds. Damage increased significantly.
Hotfix (2009-05-22):The bonus damage from spell power on the Druid ability Thorns has been reduced by half.
Patch 3.1.0 (2009-04-14): This spell will now properly use the druid's spell power to determine its scaling instead of the target's spell power.
Patch 0.9 (2004-08-17): Mana cost reduced for early ranks, raised for later ranks.
Patch 0.7 (2004-06-15): Mana cost and damage increased.