Please change the catalyst requirement on the Rat King. It requires you to play with other people that have the weapon, and only their kills count toward completing the catalyst.
Since this is an older weapon, and few people have it or even care about it, you are making an unreasonable requirement to obtain the catalyst.
Please consider changing the requirement so that a solo player can complete it.
Thanks!
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#Help
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The help section is for technical support and bug reports. I suggest you make an lfg post.