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

First, progress through the Miri Fajta quest at the Nomads' Camp until the Voivode reveals that Marika possesses the letter.

Return to Marika in Apollonia. Assist her in repelling a wolf attack. During your conversation, select the dialogue options: "He cares about you," followed by "I swear."

Marika will then disclose the letter's hiding place: a tree near a nearby river. The location is illustrated in the screenshots below.

Retrieve the letter from the tree and return to the Nomads' Camp. However, before speaking with the Voivode, it's advisable to converse with Tibor. He will 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 acquiring the "Good Old Pebbles" perk beforehand to aid in the race. Participating in unarmed melee tournaments will enhance your fighting skills for the subsequent fistfight. While Tibor isn't exceptionally difficult, he's a more skilled opponent than average enemies.

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