LazarX is correct:
Quote:
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Legendary Item (Ex): You gain a legendary item. This item grants a number of abilities equal to your tier (maximum 3). At 3rd tier, you can select this ability again, increasing the maximum to six abilities and causing the item to become a lesser artifact. At 6th tier, you can select this ability again, increasing the maximum to 10 abilities; the item then becomes a greater artifact.
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All taking it more than once does is bump the power of the single item.