Gives a 15% chance on hit to gain 4 second buff that deals 1,250% Lightning damage every second to enemies within 30 yards. This effect sounds similar to the Conduit Pylon Lightning.
You can level this Gem all the way up to rank 150. Every upgrade will increase the damage by 25% per stack up to a maximum of 5,000% total.
The rank 25 bonus increases your Movement Speed by 25% when the Lightning buff is active. The initial 15% proc chance is further reduced by proc coefficients of the used skill and does not trigger by attacks from your pets.
Wreath of Lightning Best Use
For speed farming: This Gem is mainly used for the rank 25 Movement Speed increase in Greater Rift Keystone and Bounty farming. The actual damage from the Lightning effect is meaningless, but it has nice synergy with Warzechian Armguards, as Lightning effect can destroy breakable objects, constantly triggering Warzechian Armguards Movement Speed without making you stop to use an attack.
Legendary Gem in Diablo 3
Legendary Gem Creation:
If you need extra Legendary Gems to level up, you can make the Rift Guardian in any Greater Rift drop a new Rank 0 Gem by removing all the Legendary Gems with the same name from your Equipment, Inventory and Stash.
The safest way to do that is to put them into the Inventory of different character.