1) "Rogue and ninja versions" could easily be talking about the same weapon, as in, "These twin blades are for rogue and ninja".
2a) The plurality of the word "weapons" could be referring to the fact that there is more than one primal, thus more than one weapon.
2b) The weapons themselves are dual blades. That alone could justify the plurality of the word.
3) This had to go through a translator.
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