For all the wonder and joy of travelling in time, to say nothing of the comfort that comes from knowing your home time will always be there, sometimes the weight of the centuries is too much. Just like Peri felt when she saw the Marble Station sign, the weight of history comes crashing down on the character. Any time an adventure is set on the characters’ homeworld or somewhere the character states reminds them of their homeworld, every action is at -1 unless their life is threatened.