Durchest has 2 different corruption types. One is an incoming damage reduction corruption, and the other is a tactical damage buff corruption. Durchest doesn't use any tactical damage attacks on the main tank (or if he does, its extremely rare) so neither of these corruptions are causing the tank to take more damage.
Originally Posted by jakenicho10
I've heard speculation that Durchest is one of the only mobs in the game that has a crit multiplier greater than 50%, but I don't know if thats the case. If so investing in more crit defense would be a wise choice.
Beyond that, this has always been the poster child boss encounter for the longstanding anti-warden tank sentiment. He hits hard, its common damage which the heavies easily cap (back when capping mitigations wasn't a foregone conclusion), and the threat mechanics of the fight favored guards in many of the possible strats that were used.
If you're seeing regular crits for over 16k, my first bit of advice is make sure you're over 32k morale fully buffed. Beyond that focus on keeping your +2% phys mit buff always active, your hots always up, and DC whenever its available and adds aren't in range. In a hard hitting solo bossfight having enough morale to never be 2 shot is important, as is being topped up on morale as often as possible. You may take more incoming damage by focusing on HoTs and at times many of them may go to waste, but maximizing HPS will have you taking care of the small hits yourself and leaving your healer to react to big spikes, where a focus on bpe may mean the bigger hits come less frequently but the chances of them coming at an inopportune time increase.
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