Engineers that enjoy the Tool Kit can use that handy wrench to smack their turrets around. This heals them in addition to any other heals, like self-healing, you may have going on your turrets giving your turrets the extra edge in battle. Also, you're engineer, you should heal your turrets by hitting them with wrenches!
For more information on the game: http://www.guildwars2.com/en/
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