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i think the enchament is purely random.

The think of interest, i have noticed is that the position the star lands on is always relative to the position u place your stone on. So every theory about placing the stones at the right position cant be true.

The weakness i ever heard of was about an exploit in the closed beta, that made it possible to prevent the item from breaking/downgrading while enchanting. But i didn't played in the closed beta, and the exploit was apparently fixed in open beta , or never existed all together.