There's a reason Thorn doesn't have a y2, and it's because the y1 is still good. So basically, Thorn is a y1y2 weapon.
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No, you forgot to divide. It's x1x2/y1y2=z. Numb nuts.
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Oh yeah How stupid of me. But you get the point. It's practically year two. Same reason others haven't gotten year twos.