My Strategies are very basic when It comes to boss fights.

Since all of my DK are Unholy spec they have the same rotations. Makes it easy to control aggro via deathgrip. I usually pull up in front of the boss within 15-20yrds for icey touch pull. Align my guys so their on top of each other. What I do is move into position, then single move my main back alittle bit to be in same range distance with my other 4.

So an Icey touch pull, with a plague strike attack for 2x diseases and the 3rd one applies itself. Throw down a anti-magic zone and icebound fortitute when needed. From there I just cast my other strikes and death strike to heal 2k+ on crits.

Grand Magus Telestra

I usually have some deaths here because she does a ton of magic damage that my zones cannot fully mitigate. I don't use ghouls because the aoe damage they take weakens the shields so fast it becomes useless. The reason I do unholy and anti-magic is because I have no healer, so i have to rely on maximizing any and all incoming damage. My glyphs are anti-magic and deathstrike with a minor ghoul for 20 rune when summoned.

During the initial run in, I have to get to her asap to lay a zone, then start dps rotations. With 1 or 2 zones I can get her to half before they break and heal via deathstrike with runic power max. Once she breaks into 3, I have to lay more zones and then i summon my ghouls. Every fight seems to be she's out of range on all 3 for pestilence so I just switch from 1 to the next to the next. If done fast enough, I can finish the fight with no losses, but it requires some luck and good timing on the zones. One hit from an aoe will drop my DK's by alot. By the time she's back to herself I pray I have 1 zone left to finish. Due to her ability to gravity well all of us and shake us around we can fly out of the zone and it becomes useless.

The biggest problem to watch out for is getting frost nova'd outside a zone then fire bombed...it hurts.

Anomalus

This was really easy. The only problem is the glitch where he sometimes summons 2 of those rifts. Like you said, Pestilence and switching targets makes it a breeze. Also it's all magic so zones come in handy here.

Ormorok the Tree-Shaper

Tank and spank. AMZ for the ice grip or whatever that ability is called. Icebound fortitude when he goes berserk.

Keristrasza

Stay in one spot, hop in place to knock the debuff off and dps tank'n spank. Problem with this guy is he eats through my AMZ's really fast. A good idea is to Anti-magic shell while the first AMZ is up so less is mitigated and your cooldown finishes before the 5th one drops. When he goes berserk I usually lose 1 or 2 to ghoul form if I popped icebound too soon. Also try to keep your bone armor up every once in awhile.


Yesterday in Drak'Tharon Keep I kept resetting to down trollgore over and over again for shards and the 2hander. Although I'm still debating whether to keep the Axe of Frozen Death or go with Troll Butcherer .

Again, I am trying to keep dps similiar to all 5 so I try to keep all gear the same. The troll butcherer upped my crit by 4% x.x