I can't DPS

[Affan]

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[angrylol]

That doesn't tell anything. Tough seems low.

First thing - your pet should be up, it's some 11-12% of your dps.

You should be able to do some 8-10k dps on Fester in 25man for sure --- that is if your gear is optimal at 5.5. If you dont have 4/5 set and have some stacked "GS" items, could be that you are doing best what that gear can do. No one will know what to tell you,unless you give armory link or something.

[Thydus]

You're not running morbidity while running deathcoil focus'ed glyph and Unholy Blight.
Your running sub spec blood, which is only really for dungeon gearing phase, unholy's main source of damage is auto attack, not having melee haste from frost tree plus shadow dmg increase, is a massive dps loss.
As for your gear i cant tell if you were tanking recently or ur just using what you have from both specs so can't comment on anything besides the fact ur crit looks a bit on the low side.

[angrylol]

I would buy Sigil for EoT
Then replace helmet and pants with T9 (but omg my GS will be lower :(:(:()
Replace glyph of Icy Tocuh with Glyph of Disease to make rotation not so annoying(incoming "omg sims show that glyph adds 0 DPS hurrdurr" lol)
Replace tank Waist and Ring ASAP (POS http://wotlk.cavernoftime.com/item=49808 ; POS http://wotlk.cavernoftime.com/item=49812) easiest to get
Get a better trinket
Replace PvP Neck and Back ASAP (POS http://wotlk.cavernoftime.com/item=49818 ; HOR http://wotlk.cavernoftime.com/item=49842)
Collect EoF for next 3 T10 parts, because you will not use T10 Gloves in the end.
Switch to Frost sub-spec, drop Dirge and take 2/3 Morbidity (0/17/54)
Read a guide to get better. Stat wise you are not even as strong as another DK with 5k GS and right gear.

[MaXiMuS54]

Your character is a mess and its clear you've never looked at a guide. At least you didn't put berserking on your weapon like some newbie dks I've seen

[hezente]

I agree with MaXiMuS54, your character is a mess.

Lets start off with:
Don't gem stamina.
Only use a nightmare tear to unlock your meta gem.
Rest you gem str/str+crit/hit or str+hit.
Also you might want to enchant your gear.
If a piece of gear has a blue gemslot gem pure strenght. (Except that on piece where you use a nightmare tear in the blue slot.)

Obviously you should NOT use tank gear.
It is a dps loss even when you gain gearscore.

As mentioned, your talents are wrong and you'll have to get a proper spec.

Read a guide about your class.
Learn from it, test it out and become a master overtime.

Ps:
Instead of gemming hit you can replace the pvp trinket for the other EoT hit trinket.

And what Angrylol said.
Even tho glyph of disease is really chill to have, it will result in a dps loss.
So if you wanna use it go ahead, but once you are comfortable playing your class i suggest you to change the glyph.

[OhieMitzen]

A guide: http://forum.warmane.com/showthread.php?t=349829
More DK guides: http://forum.warmane.com/showthread.php?t=325595