Understanding Diablo 4's Combat Mechanics.

Thorns is a passive feature in Diablo 4 that attacks enemies when they damage you, reflecting a small part of the damage you take. It can be increased by finding special armor, learning skills, or equipping aspects, and can be further boosted by increasing primary stats and using elixirs. Thorns is most effective for tank-type characters like Druids and Barbarians, while other classes should focus on increasing defense.