Zybr
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I don't think it's necessary to publish the setting for the game.
There can be many reasons. For example, it might not be fully developed, but there's a long queue, and it will potentially be ready by the time the game takes place. Or, perhaps, the GM simply doesn't want to reveal it before the game starts, to create a surprise.
Барон "Vampires"
Отдай свои прошлые сны,
В сомненьях себя обрети,
В бешеном танце душа кружится!
Не думай, что будет потом,
Здесь и сейчас мы живем,
Стань хоть на миг сам собой, слышишь!