Final answer:
Strahd von Zarovich allows the Vistani to travel freely in and out of his land for various reasons, such as leveraging their abilities as informants, maintaining alliances, demonstrating power, and possibly due to magical or cursed pacts.
Step-by-step explanation:
The question pertains to Strahd von Zarovich, a fictional character from the Dungeons & Dragons universe, specifically the setting of Ravenloft. Strahd is a vampire and the ruler of the land of Barovia. He allows the Vistani, a nomadic group of people, to come and go freely from his realm. There are several possible reasons for this.
One reason might be that the Vistani have served Strahd in various capacities, perhaps as spies or informants due to their ability to travel across different domains of dread. They also have magical abilities that allow them to navigate the Mists of Ravenloft, something that Strahd might find valuable. Additionally, the Vistani might serve as a connection between Strahd and the outside world, bringing him news, goods, or new victims.
Another reason could be Strahd's need for allies or the semblance of power. Allowing the Vistani to travel freely could be a calculated move to maintain a sense of control, demonstrating that Strahd has the power to permit movement in and out of his domain, and by granting the Vistani special privileges, he ensures their loyalty or at least their neutrality.
Lastly, the Vistani's freedom might be part of a curse or pact made with Strahd, a metaphysical or magical compulsion that he cannot easily break. This aspect is often explored in the lore where Gothic and supernatural elements intertwine, creating complex relationships between characters like Strahd and groups like the Vistani.