You blatantly withheld information to create hype and sell more copies. That is a lie. Fix this situation in the way you know you need to.
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They didnt say ANYTHING about the activity besides that it was new and could be farmed. They didnt lie, and the information they withheld wasnt meant to lead anyone to any decision. If you heard that and thought ''I bet its a solo activity'', thats on you, you let yourself think that.