For the Pet Battle ability, see . For the other, similarly-named PvP talent, see [Thorns ] . [Prickling Thorns ]
Thorns Level 35 Balance, Feral, Restoration druid PvP talent 40 yd range 18% of base mana 45 sec cooldown Instant cast Sprout thorns for 12 sec on the friendly target. When victim to melee attacks, thorns deals X Nature damage back to the attacker. Attackers also have their movement speed reduced by 50% for 4 sec. Usable by Class
Druid Properties School
45 seconds Other information Level available
35 Related buff
Melee attackers take Nature damage when hit and their movement speed is slowed by 50% for 4 sec.
Duration: 12 seconds
Movement speed reduced by 50%.
Duration: 4 seconds
We can learn much from the elder vine, which threatens with barbs the hand that would trim it back. 
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.
Notes and trivia
Azerite essence power grants this talent when used by a Balance or Feral druid. [Conflict ] When Thorns deals damage, it can trigger
procs such as . [Ancient Flame ] 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 alpha, the honor talent was named Legion Razor Thorns. 
Patches and hotfixes
Fixed an issue where Thorns was not dealing damage to attackers after being melee attacked. Hotfix (2020-12-01):
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%.
Resolved an issue that caused Thorns to deal damage when the target is struck by unintended spells such as Hotfix (2019-02-20): , [Eye for an Eye ] , or [Frost Fever ] . [Virulent Plague ]
Patch 8.0.1 (2018-07-17):
Now a level 40
PvP talent (was a rank 19 honor talent). Now available to Balance, Feral, and Restoration (was Restoration only).
Thorns now has a 1 second cooldown between procs. Hotfix (2016-10-26):
Patch 7.1.0 (2016-10-25): Now deals 5% of the attacker's total health in Nature damage.
Patch 7.0.3 (2016-07-19): Re-added as a rank 19 honor talent. Now lasts for 15 seconds, down from 20 seconds.
Patch 5.0.4 (2012-08-28): Removed.
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.