Hi! im just a fella trying to finally contribute what I can to this site! So I decided to throw in a small arena specc guide for DK's.
I know most of the ones already playing DK as their main probably know all about this specc but some of the people who just rolled an alt or something might not.. and that's the people this guide is for!
Shadow frost! - Talents
Here I will give you a link to the most common variant of this spec: 0/21/50
Variations: 10/11/50 This specc is a less used one which gives you the extra AP from bladed armor insted of killing machine and death chill
Rotations/How to play
So basiclly your main attack will be Icy touch.
Now at first this might seem to be a very weak attack but while getting all the extra damage from thoose frost talants, 13% extra magic damage from Ebon Plague and extra spell dmg from impurity talent your icy touch's really starts to hurt and has potential of a HUGE burst. And on top of that Icy touch will be a 30 yard range attack which comes really in handy at times in arena.
Since you dont specc for scourge strike you wont be using your unholy runes for anything except PS or death&decay at few times. Therefor the desecration combined with the blood boil and some chains of ice will add a big ammount of slows.
So basiclly what you do is nuke with Icy touch, spam PS to use your unholy runes and get desecration + blood plague up and use pestilence + blood boil for some aoe damage and slow.
Your basic rotation would be something in the way like this:
IT -> PS -> PS -> BB -> BB -> IT
Wait for your death and frost runes and then relase that burst!
IT -> IT -> IT -> IT -> PS -> PS
Gear
Spell penetration: Icy touch is a pure magic attack so in arenas it comes really handy to actully get some spell penetration. You want to get at least 75 spell penetration to negate most common resistance buffs/auras in arena. Get this easily by enchanting your cloak with spell penetration and getting 2x Stormy sky sapphires(blue sockets).
Sigil: Sigil of the Frozen Conscience This is a must have for shadowfrost specc. Increases the IT damage alooooooooooooooooooot! It's also very easy to get. Just do a few dailys from Venture Bay and you should be able to afford it within 30 minutes or so.
Hit %: You want 165 hit raiting (5%) combined with Virulence talent takes care of all the melee and spell hit you need.
Other stats: When you have got all of theese strength/ap is the way to go(extra spell dmg from Impurity talent) and crit comes prio nr 2. Hit is close to worthless after getting 5% and getting over 75 spell penetration is only needed for a very very few fights which makes it not worth to get more.
Glyphs
Blood boil: This is a must have glyph for most dk's in pvp. Adds a very nice range and aoe(with pestilence) slow effect.
Of the Ghoul: This adds more survivability and damage for your ghoul and also increases the damage from explode corpse if you specced that by alot.
Icy Touch: Since you will be spamming IT so much the extra RP from this glyph really adds up and helps alot to keep your RP up while having gargoyle nuking.
For minor glyphs there are no really important ones so go for what you like.
What pressence should I use?
Frost: This is kind of obvious but use this when your getting nuked hard to survive. Switch back to frost/blood for damage when you feel safe enough.
Unholy: This pressence gives a much better burst possibility since spamming 4xIT takes time due to global cooldown.
Blood: This pressence is still good for shadowfrost specc but not at all times. It gives better sustained and overall damage which can come in handy when your trying to win the mana war vs some healer/dps teams.
Hints and small tricks:
When you use Lichbourne you can heal yourself with death coil and lichbourne also makes you immune to sap/poly since you are not counted as humanoid but undead anymore. Because of this shackle/paladin fear works on you while you have used it.
Speccing for corpse explosion can provide you with even a bigger burst capability! Combined with Ebon plague/glyph of the ghoul and ravenous dead talent your ghoul explode will _hit_ for around 5k. Use this macro to make life easier for this:
/target pet
/cast Corpse Explosion
/targetlasttarget
Using pet stun before you explode your target makes it easier to actully hit it.
Using pet sacrifice not only helps you survive but also saves a chunk of your healers mana from times to times. I use this when Raise dead spell it out of cd.