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Signet of Weariness does have a high recharge time, but it could be useful in an Energy denial build. Energy is rarely a problem for Elementalist primaries, but most other professions rarely have more than 40 or 50 Energy, usually resulting in a strategy which requires careful budgeting of energy use. Removing 8 Energy from enemy Monks, Rangers, or Warriors at no cost to you, especially if you can hit multiple targets while they are clustered, could turn the tides in a tight PvP or GvG battle.