Tesham Mutna is the penultimate quest in The Witcher 3: Blood and Wine and is the final boss fight between Geralt, Regis, and Dettlaff. The decisions you made in the previous quest are vital for the fates of all involved, and it's time for Geralt to slay the Beast of Beauclair to stop the vampires from ransacking the city. This isn't going to be an easy fight, so you can find a guide on all three of Dettlaff's boss fight phases, along with tips on how to beat him.
The fate of Syanna depends on what you did in What Lies Unseen or Beyond Hill and Dale:
Dettlaff is perhaps the hardest boss fight in the entire game, and has three phases. The boss fight begins with Regis and Dettlaff fighting in the distance, which allows you to prepare by any means necessary. Make a manual save before the fight, and don't bother with Vampire Oil, Axii, or Yrden, as these have no effect on Dettlaff.
The only thing I can truly recommend is Quen to shield yourself from his attacks, and White Raffard's Decotion, as it will instantly restore +35% Vitality, which is great for those on Death March who can't rely on a slow-healing food item.
When you're ready for the boss fight, approach Dettlaff and Regis, and good luck.
Phase one is identical to the Beast of Beauclair fight from "Blood Run" mission. Dettlaff will swipe his claws forward, which opens him up for a fast attack before he dodges away. You should attack in intervals, waiting for his swipe to end so you can perform a quick attack yourself.
Dodging is better than parrying and blocking for this phase, so when he teleports or attacks, dodge behind him and try to land two fast attacks. Repeat this process, and make sure you have Quen activated at all times. Once his health lowers by one bar, phase two begins.
Dettlaff is at his most dangerous in phase two, and the main attack to watch for is when he begins to charge up in the sky with a swarm of bats. As soon as you see Dettlaff swarming with bats, run the other way and start spamming A/X to roll out of the way of them, as they can easily insta-kill you.
سەرچاوەی فەرمی بە زمانی ئینگلیزی: https://gamerant.com/the-witcher-3-quest-guide-tesham-mutna/
