There are a lot of things trying to take your unlife in The Blood of Dawnwalker. However, at the top of the food chain are the vampires that make up Brencis' court. Each one controls a different region of the map, and you'll want to beat all of them if you want to weaken Brencis before your fight.
One of these three is Ambrus, the youngest of the group and the vampire who oversees all the blood harvesting for the court. However, like many things in this game, getting to and defeating Ambrus is not that simple. Here is everything you need to know about unlocking the Ambrus fight, his quest, and how to defeat this boss.
To trigger the Ambrus quest, you will need to first disrupt his plans enough to make him come out of hiding. This is done via raising his Anger meter in the Court sub-menu. You can increase this meter by destroying his leech farms, blood storage, and stopping prisoner transports along the road.
All of these activities will be marked on your map when you're near them with the symbol of Brencis' court and will show Ambrus' face when you highlight it with your cursor. Completing any of these activities takes time, and it will take a few days of in-game time to finish enough activities to force Ambrus out.
Once the Anger meter is filled, a new quest will be available when you go to the small town of Maragir (shown above). This is on the east side of the map and is south of the Maragir Wealds text on your map. It will be marked on your map as a question mark, so don't expect to be instantly guided to where you need to go.
The quest itself is called The Gilded Gauntlet.
The first step of this quest tasks you with investigating the strung-up villagers in the town square. It turns out Ambrus has taken offense at your meddling and is punishing the locals for your trouble. When you arrive, speak to the villagers gathered around the dead bodies to trigger a brief cutscene where you learn that the dead men were the family that oversaw Maragir.
You'll then learn that Ambrus has challenged you to a fight to the death; however, before you can accept, the vassal of Ambrus will request your presence at his hunting lodge. Now, you can either choose to go with them to hear him out or just ignore the invitation and go right to the duel.
سەرچاوەی فەرمی بە زمانی ئینگلیزی: https://www.thegamer.com/the-blood-of-dawnwalker-ambrus-boss-drain-kill-let-him-in-unlock-quest-guide/