So I'm playing on my DK hoping to replace my Rogue by the time Tomb comes out (so obviously I've got a lot of time here) but the AP grind is kind of real.
I was sitting around Dalaran basically AFKing when I suddenly got the thought that I should probably learn to tank so I can actually just get Mythic groups and such, no? I don't know shit about Blood tanking or how good of gear I need to start on the lower levels of Mythic+. I haven't really tanked in years, but as far as I gather they don't really have much in the way of dedicated tanking gear anymore, right? Or do I have to start over and grind out new gear sets? I'm not really looking to go hard on it, just to have a solid off-spec I can actually use.
Tips?
I mostly only tank in mythic+, and DPS in raids. But my mythic+ group is quite dedicated and we can consistently clear +15s under time.
For gear: get as much haste as you can. I like crit because it's nice offensively and also gives parry, but yeah I just wear what has the most haste. Set bonus is boring but effective.
There are tank trinkets, but they are of questionable use in mythic+. I use a couple weird ones - a long time ago I got an 895 version of the trinket from Nythendra that has a ton of haste on it. Its use ability drops a bunch of shit on the ground that does damage and gives you a nice pile of leech. Synergizes well with D&D and AOE pulls.
I recently started using Terrorbound Nexus because I got one at 900, its proc sends out damage waves in 4 directions. It is consistently 10-20% of my damage in mythic+, and I only do high level mythic+ so I don't make huge pulls. I'd imagine it'd be nuts in Karazhan or low level mythic+.
Last night I just got the fang off Tichondrius. It gives like 4500 leech for 12 seconds on use. I bet that'll be fun with Vampiric Blood active. And thematic! But yeah, I keep every trinket I find and experiment. So far almost all of the actual 'tank' trinkets have been underwhelming, the ursoc armor one can be nice I guess.
Outside of gear, my tips are to think about how you're going to deal with mythic+ affixes ahead of time. Even if you know how to pull a mythic+ correctly and efficiently, and you'll be expected to, most affixes are the tank's problem. This week in NA is one of the only sets that isn't and even then, if you accidentally double pull with Bolstering you can get fucked over. For a Blood DK Necrotic is your archenemy, although it's manageable with the Death and Decay slow, AMS, and smart kiting.