It increases Thorns damage done. Upgrading increases the damage bonus even further.
At rank 25, it also Taunts the first enemy hit by any Primary skill. A skill that hits more than one enemy at once will Taunt the closest one to the hero. Considering the usual bonus, it is actually beneficial for the wielder, as enemies will be forced to attack them and therefore receive more hits from their own attacks. Primary skills include even Witch Doctor and Wizard Signature Spells.
This gem was introduced as a match for the Thorns of the Invoker set and Thorns revamp in 2.4. As such, it is most useful for Crusaders, but may be used by any class. For maximum effect, this gem can be combined with other Thorns-enhancing items, like Hack, which applies Thorns damage to offensive attacks.
This fragment of a gem, called a chip, was discovered in an underground vault by old man Boyarsky, who fashioned it into the beautiful gem it is today. It damages those who would damage its owner, and once inserted into a socket, it will never fall out.
- This gem uses an icon of the cut gem called Shen's Delight, but with barbs over it.