Introductionnot my best banner ever, but sister's kids are frustrating me so I gave up
Many of the guides here are out of date, invalid images, or info, or whatever. To pay respect to those guides, I will quote them at times, as I'm not trying to say mine is better, just more up-to-date.
Talents
This talent, requires 1 mandatory point.
-All of the red icons, are optional talents. I personally, have never seen a high rated DK with blade barrier, but I have heard of it. And I have seen middle tier DK's with it. So I won't recommend it, but it's there, for completeness.
-The 1 point in Rage of Rivendare (RoR) can become a 2nd point into Sudden Doom (SD) if you prefer. However, it's personal preference. I prefer RoR. SD is rng based on autoattacks and I feel better having a slightly harder hitting Scourge Strike (SS) when it comes to the execute phase or vs opponents that do not heal enough for Necrotic Strike (NS) to be worth it.
-RoR is only worth points if you have a T2 Cata weapon (or equal+ damage PvE weapon).
-Generally speaking, the 2 remaining points tend to go into either RoR or Bladed Armor.
-Technically, the Improved Mind Freeze talent is considered optional but I would never opt out of it. I don't even consider it optional, but still.
-I have never done Rated Battlegrounds (RBG) as an Unholy DK, but I've been told Epidemic and Contagion are good in RBG, or perhaps normal battlegrounds (BG). I still run my default arena spec in BG's though. Again, I cannot vouch for this, but it's inserted for completeness. There will be players who say no, and who say yes, I would not believe any of them myself. So many self proclaimed know-it-alls who truthfully don't know sh*t about anything, regardless of their rating. If someone produces the results of a good test, then you can believe them. If I'm curious, I'll test things myself, but I'm not, not about this anyway. I have played with Contagion before, but it was for lawls, I wasn't paying attention to anything to determine anything. Also I was not reforged into mastery for harder hitting shadow damage. Which is likely what you should do if you're playing around with contagion.
Glyphs
Stat Priority
5% hit (601 hit rating) > Spell penetration*>Strength>BLAHBLAHBLAH*
Spell Penetration - People will tell you to get spell penetration, generally 195 to negate priest shadow protection buff or Paladin's Aura. But this is not necessarily true on Warmane, especially since 2's is the go-to bracket here. Depending on what comps you fight in a ballpark range of your rating, will determine how much spell penetration you need. I am currently running 195 myself though.
BLAHBLAHBLAH - Assuming a perfect world, where EJ didn't completely fk up their theory crafting for DK's this time around, Haste would be king. But, it's not a perfect world, and EJ did fk up on so many things for DK's that no one really knows the answers. Crit has been shown to beat haste when you have limited uptime and a lot of target swapping. But I don't know (sorry) if crit is properly affecting pets here. Mastery is said to be better then crit if you have Gurth since tentacles scale with mastery. The 'safest' bet would likely be Haste>Crit>Mastery without Gurth, and either one with it (I do games without a single tentacle proc so I would not personally prioritize Mastery just for having Gurth). However, if you have the time, I'd recommend you personally testing out Crit>Haste>Mastery for yourself [not in an actual arena match where you're aiming for rating, just in case it's inferior], with taking approximate uptime, swapping, multi-disease management into account. I multiclass, so I likely won't ever get around to testing such things.
To get the best stats available, use the addon ReforgeLite. Input values. exact numbers aren't important, just that priority ones are higher, and hit is the lowest but still greater then 0. Example: Hit-10, Haste-100, Crit-50, Mastery-30, Expertise-20. With the Hit dragdown bar option set to: Hit | At least | 601 | 0. From then on, just click calculate, show, reforge.
Playstyle
-You'll be switching between Unholy and Blood presence. Though mostly in Unholy Presence. VS some comps you will spend more time in blood then others. VS Rogue teams, or other heavy opening damage comps, you may want to start the fight in Blood even.
To further elaborate on this, instead of explaining it myself, let's allow good ole Reinhardt to do it :D
Runic Power (RP) and Rune management
You will apply your initial diseases with Chains of Ice and Scourge Strike, order depending on if you can make it to your target without being slowed or not for the most part. That is your rotation. And your rotation ends, right there lol.
Instead we have priorities, or objectives. Such as, keeping diseases on your target(s).
Do we prefer Festering strike, or Blood Strike/Chains of Ice? Short answer is: Both. Make sure both festering strike and blood strike is keybound. When I first started playing cata, I figured I could replace blood strike with festering, but that's not good. Neither is using only blood strike.
Do not spam death coil unless the target can die from it. I can't remember off the top of my head but I believe it's somewhere between 3-5 seconds before we're "allowed" to use another coil unless RP Capped.
More tips and advice need to be added, but it's getting late, so I'll edit later. So instead, here's some additional resources:
Ceiron's Guide
Evolocity's Guide
Turbolqk's Guide
https://www.youtube.com/channel/UC0v...'s Channel
Addons
Gladius
MoveAnything
OmniCC
Quartz
Gladiatorlossa
Raeli's Spell Alerter
ummm.. so many more.. Doom CD Pulse, umm.. Bartender/Dominos [I use default UI personally].. there's a lot of great addons, I can't cover them all lol. Many people in battlegrounds have been asking about my bg healer announcement add-on, that's BGSpy.
Macros
Spoiler:Show
List of variety of macro commands - Via WoWwiki
More Macro Info - Via B.Net
Okay so I'm done for now. Needs work, but not tonight :P