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To keep it brief, an upgrade of Robes of the Magi. Reduces active willpower costs by 1/3, in addition to the mana. Cost: 1600 (or just 600 if you're upgrading from Magi robes).
In prolonged combat, magi, shamans, sylvans, etc. can burn through willpower pretty quick. My first thought was a willpower vibration but that only addresses one class. Anyway, this seems like a reasonable artefact to add. The only effect is that it lets people who want to fight longer fight longer. Less immediate benefit than plain Magi robes if you think about how that helps guard against Apostates/Priests.
Yea or nay?
I like my steak like I like my Magic cards: mythic rare.