So with all the DW talking of tanking I thought I'd share my thoughts since I was DW tanking back in nax25 days, tons of fun and tough to do. First thing of course, macro Rune Strike to every ability in your rotation and you will almost never need to worry about aggro. Also to answer the above question SoB is amazing for rp generating with DW.
I'm taking DW tanking to not just be able to tank a boss's physical dmg, but more importantly the magic dmg that bosses will be dishing out. So consider this the DW DK Magic Tank:
Here's my spec:
18/51/2
With a rotation of IT-PS-BS-BS-OB-FS rinse, repeat and if BoN procs (b/c I chose to put 1 pt into it just for a filler) then an extra OB. Time KB with HB if possible. And as for all DK tanks, always keep your Blade Barrier proc up. Time Rune Tap for Unbreakable Armor.
Anyways reasons for this build:
Strengths:
High aggro, you will be seeing crits quite often with this build, especially when GoRS is used which I think all good tanks should be using
High survivability both phys and magic especially (the dodge debuff that all tanks will suffer in ICC makes parry much more attractive and makes abilities like Avoidance much less attractive since you'll only receive 1/2 the normal benefits).
The 1 CD that all DK tanks need to use, Icebound Fort, gains another 6secs from Guile of Gorefiend.
IFP a must have ability so FP will now give you 10% dmg red.
I focus on Spell Deflection and Acclamation to be essentially a go to offtank or MT.
Unbreakable Armor is nice to have and pretty essential if ur getting hit too hard.
Hungering Cold is good for bad trash pulls or when little adds get a bit too heavy like Anubs little scarabs or the Gothik fight from old Naxx.
Duel Rune of Swordbreaking is really helpful for avoidance and will be amazing come ICC when parry > dodge
FS damage does not rely on having both diseases up rather just 1, with Glacier Rot, so letting 1 of ur diseases fall off isn't too much trouble
Also GoRS really helps maintain RS crits b/c raid buffed and all, you should be getting around 20% RS crits, not the greatest but helps a lot
Finally: probably one of the most unique builds out there that has proven for me to work quite well. The magic resistance is awesome and with GoAMS you can pop AMS for dragon breaths, Anub leech swarm etc and take in the benefits from acclamation.
Weaknesses:
Health pools come into play big time with DKs as always b/c if we don't go Veteran of the Third War we sit with very little base health. (In fact even with VotTW DKs are still aweful in health pools)
Finding Slow/Slow Tanking wpns, basically I wouldn't suggest this spec unless you had a slow 1hander which I was fortunate to get on a 25ony run. The end goal for me is to have the 245 and 232 version of Quel'Serrar since the procs should stack and they both swing at 2sec as opposed to 1.6s.
Magic Defense somewhat erratic since Spell Deflection goes off parry % it's never 100% and acclamation has to build up to have a good effect (the idea of using acclamation is assuming ICC will have fights always dealing magic dmg like Sapphiron and Twins so it'll hit 3 stacks quickly)
Lack of DnD and Epidemic make disease refreshing a pain. Also 2t10 gives a DnD buff to tanking which wouldn't be using often in this spec other than initial pulls and for add down times.
Lack of Expertise cap in the build, I'm short 2expertise in this build which hurts and there's no way around it unless you wanna sacrifice HB.
Getting Dcapped without the 1h enchantments at this point is difficult. (I managed to do it sadly had to socket and enchant a few +d rating items)
Conclusion:
I personally love it as a DW tank spec. I think magic resistances is highly underrated at this point and will be very valuable for ICC encounters. I need a lot more hits, say 2-3k more but that's a gearing issue and not as much a spec issue at this point.
I'm looking for thoughts and feedbacks on this to see what people think. Also I understand that this build actually does rely on slow/slow wpns which means you NEED Quel'Serrar of some lvl and if you can get ur hands on both the 245 and 232 version of the wpn then ur looking at really sexy defense/armor buffs. Also, getting ur hands on the Ony tanking ring 10/25 either version would just make you an even sexier magic tank.