Camyu is assassination. Daewen is combat. I'm not sure about Lemeeng. Assassination provides Master Poisoner buff which is 8% damage increase to spell damage. Combat provides physical damage buff, whereas Subtlety provides Crit buff.
Assassination Spec (4.0.3 at level 85)
Camyu is specced
31/2/8 right now. The point in Deadened Nerves (reduce damage by 3%) can be put in Deadly Brew (apply crippling on top of instant poisons 50% of the time). I also only took 2/3 Precision instead of 3/3, because i put the 1 point in Opportunity. I figure hit on gear can make it up (more on this).
Weapons
MH slow dagger (1.8) - Instant Poisons
OH fast dagger (1.4) - Deadly Poisons
Thrown weapon (for Fan of Knives aoe and use Deadly Poisons) or Gun/Bow (for if you wanna switch out doing single target as a stat stick)
Rotation
To open, stealth to gain the Overkill buff, then Mutilate (or Garrote if you need a silence, or Cheap Shot if you need a stun), then put up Slice and Dice (SnD). From there on, Mutilate to 4+ combo points (cp). Use Rupture at 4+cp if it's not up (to proc Venomous Wounds), otherwise hit Envenom at 4+cp. Envenom also refreshes your SnD, so if you see SnD about to drop, you might want to hit Envenom. When boss is at 35% health or below, use Backstab to build your combo points instead of Mutilate, assuming it is safe to stand behind the boss at the time.
Hit your Tricks of the Trade every 30 seconds on another rogue (if the favor is returned in order to get a 6 second damage bonus). Or hit it on a tank to pass on your threat temporarily. It costs 0 energy if it is glyphed.
Glyphs
Prime: I use Mutilate, Backstab, Rupture. There is a Vendetta glyph that is also an option.
Major: Tricks of the Trade, and then whatever you feel like
Minor: Pick Lock is love. So is Safe Fall.
Stats
For assassination, Agility (2.6EP) is the money stat. After that, the theorycrafter says that at T11 gear (which we are not at currently):
Yellow hit (?) > Spell hit (1.4) > Mastery (1.3) > Haste (1.2) > Expertise (1.1) > Crit (0.9)> White hit (0.75?)
Yellow hit is for Specials attacks and there is really no way to miss this. Spell hit is for poison hit cap, and since assassination rogues are very heavy in poison damage, this is important. White hit is for auto-attacks. I forgot all the numbers required, but at 2/3 Precision, the hit number I care about is 1332 (17% spell hit). Expertise is kinda meh because of the fact that we are spelly, and Crit lags pretty far behind that.
Cooldowns and tricks when you get heroism or some fight mechanic that allows you to do insane damage
- Vendetta: 20% damage increase for 30 seconds on a 2-minute CD
- Cold Blood: refunds 25 energy, and your next non-dot attack is a 100% crit. Also on a 2-minute CD
- Vanish: It's not just a oh-shit-dropping-all-threat kind of a button for assassination rogues. When we break stealth, we get the Overkill buff, which allows us to regenerate energy 30% faster for 20 seconds after breaking stealth. So time the use of Vanish smartly.
Other cool rogue utilities that I have on my bars, and yes I use ALL of these. I'm running out of room on my bars...
- Fan of Knives (our only AoE button) - note that you need Thrown weapon for this in the range slot, and you can also put poisons on it. I recommend Deadly, unless the fight calls for Crippling to slow.
- Recuperate - self heal-over-time based on combo points
- Redirect - transfer combo points from target A to target B, 1 minute CD
- Evasion, Combat Readiness for oh-shit tanking
- Cloak of Shadows to remove debuffs (glyphed version also reduce physical damage)
- Feint to reduce threat and reduce AoE taken
- Kick (glyphed version awards successful kickers by decreasing its cooldown, but penalizes you for missing it)
- Kidney Shot (stun!)
- Blind (good when soloing stuff)
- Shiv (mainly to get rid of enrage)
- Dismantle (disarm weapon)
- Deadly Throw (kinda meh but I use it sometimes)
- Eviscerate - put it on your bar, just in case you're not paying attention and you run out of poisons on your daggers. That'll be your backup finisher button, as Envenom won't work without poisons.
- Smoke Bomb (new spell! good for pulling a straggler caster into the group)
- Sprint (and also the worgen mini sprint)
And minimally on your stealth bar (and macro some of these with a Pick Pocket for good thieving)
- Sap
- Distract
- Disarm Trap (was good for the trash room before Marrowgar!)
- Tricks of the Trade
- Cheap Shot
- Garrote
- Mutilate
- Envenom
- Maybe Ambush, but I dont use it much.
- Recuperate (doesn't break stealth)
- Sprint (doesn't break stealth, but the worgen mini sprint does!)