PoE Double Strike of Momentum transfigured

Double Strike of Momentum. Attack, Melee, Strike. Level: 1–20. Attack Speed: 80% of base. Attack Damage: 60–95% of base. Effectiveness of Added Damage: 60–95%. Requires Level 1 Performs two fast strikes with a melee weapon, gaining stages which cause this skill to attack faster. All stages are lost when you move. 10% more Attack Speed for each Stage Gain a Stage at the start of each pair of swings Maximum 10 Stages Additional Effects From Quality: (0–4)% more Attack Speed for each Stage Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.

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Alternate quality gems, labyrinth helmet enchantments and unique threshold jewels are all systems that were trying to subtly modify the behaviour of skills. With this expansion these have been combined into a new system called Transfigured Gems that allows us to fully achieve the goal of these three systems, and then some.
Transfigured Gems are alternate versions of existing skill gems that have different functionality and balance than their regular versions. We have added many of these, with interesting variations that drastically change how existing skills play.
Some existing skill gems have had stats or interactions removed from the base gem and moved to the Transfigured versions to provide more focused support for pre-existing alternate playstyles.
The Divine Font at the end of the Labyrinth is now a gem crafting device that can modify your skill and support gems by turning them into Transfigured Gems, add Quality or Experience to Gems, or sacrifice a Gem for one or more Treasure Keys to open Izaro's Chests.