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So it isnt even possible to get Wings of Argentus with LP rn, because there is no level 115 Zone to farm it? Or do i getting something wrong?
The minimum area level required for a unique to drop with LP is 19 less than its effective level for legendary potential. So, a unique 115 effective level for legendary potential, such as Wings of Argentus, can drop with legendary potential as long as you're in a level 96 area or higher.
Using a rune of ascendance always counts as area level 100, so that you don't need to horde them until you find a level 100 area, but has a lower chance of rolling legendary potential compared to dropped items.