Obtaining the Voivode's Letter of Safe Conduct in Kingdom Come: Deliverance 2's Miri Fajta questline involves several steps. This lengthy side quest requires careful navigation. Here's a detailed walkthrough:

First, advance the Miri Fajta quest at the Nomads' Camp until the Voivode reveals Marika possesses the letter. Return to Marika in Apollonia.

During your conversation with Marika, select the dialogue options: "He cares about you," followed by "I swear." This will prompt Marika to disclose the letter's hiding place – a tree near a nearby river. The location is illustrated in the images below.

Retrieve the letter from the tree and return to the Nomads' Camp. However, before speaking with the Voivode, consult Tibor. He'll propose a wager for both the letter and an amulet.

This wager consists of two parts: a horse race and a fistfight against Tibor. To improve your chances, consider obtaining the "Good Old Pebbles" perk beforehand for the race, and participate in unarmed melee tournaments to enhance your fighting skills. While Tibor isn't exceptionally difficult, he's a more skilled opponent than average enemies.

Successfully completing the wager secures the Voivode's letter of safe conduct. For more Kingdom Come: Deliverance 2 guides and strategies, including acquiring the Royal Treasury Key and pursuing a romance with Katherine, check out The Escapist.