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The mercenary guild deals with specific contracts. A client comes, offers a contract to someone they like, and in case of a successful agreement, the latter fulfills the terms of the contract (they receive payment upon arrival at any guild branch after successfully completing the agreement). Accordingly, they do not claim any "loot" or whatever according to the agreement and must also follow the client's instructions, unless they cross certain boundaries. In "Lunaia," people with similar or partially similar interests simply gather to conduct future business.