Before play, agree on tone: this is a survival adventure with apocalyptic imagery, dead settlements, and children in danger. Use the safety tools your table prefers, such as lines and veils, the X-card, or an open-door policy, and name them out loud. Confirm that dinosaur horror, mass destruction, and cult sacrifice are acceptable, and offer to soften the chapel scene if needed. Build characters together and explain that the party begins with a shared gap in memory; let each player decide one false memory their character clings to. Establish that the party already trusts one another enough to travel together, and that fleeing a fight is always a valid choice.