Iron Maiden (Crusader)

Iron Maiden is a passive skill, unlocked at level 50.

In-game
The Thorns damage increase is additive (not multiplicatively) to all other similar modifiers.

Trivia

 * In real world history, iron maidens were mythical medieval torture devices designed to non-lethally impale the victim with spikes. While they did not exist in reality until XVIII century (and there are no records of them ever being actually used), they do have a real prototype: a German "barrel of shame", a spikeless ironbound coffin mostly used on women, hence the "iron maiden" name.