what is thorns in diablo 4

Thorns is a passive effect in Diablo 4 that reflects received damage back towards enemies. When a player is hit by an enemy, a percentage of the received damage is reflected back towards the enemy, depending on the players thorn count. Thorns damage is amplified based on the characters primary stat, which varies by class. Thorns is primarily gained by wearing gear that has the appropriate affixes, and some classes have skills that passively grant them more Thorns damage. Thorns is a powerful damage type when used in the right circumstances, and its part of some of the best builds players can use in Diablo 4. Thorns is more commonly known as damage reflection or retaliation damage in other RPGs. Thorns is best used in melee-oriented, high-health classes such as the Barbarian and Druid, as they have the highest survivability in melee combat, even in dangerous Nightmare Dungeons.