Any race works for this, although most would like to use Khajiit for it's bonuses to critical chance. I used imperial for the ease of hitting attribute softcaps. If you want to go Vampire, Dunmer also makes an extremely attractive choice.

For gear, you're looking to a 0/7/0 full leather build, or possibly a 1/6/0 or 0/6/1 depending on set items. I've done both, using the Cowl of the Warlock or the Crest of the Dragon as my seventh piece... but I find 3% critical hit chance per non-MA piece makes going with 2 off-types a matter of pushing it a little. You can get away with it as a Khajiit I'm sure... but there's also the matter of cheaper roll/dodge to take into consideration, and this build doesn't exactly end up hurting for magicka too terribly.

Weapons are specific. Since you're going dual wield, the attractive Twin Blade and Blunt passive pretty much tells you that you want swords or daggers. I went with daggers, both using the precise trait. My DPS went up a bit over using the armor penetration trait, and criticals are key. While I carry a pair of maces with armor penetration on them (enchanted with crushing), I pretty much only do this for PvP when I'm stalking a tin can... and it works. Both of my daggers use irresistable damage glyphs, and are of the Night Mother's Gaze set... criticals are key .

Armor sets are of Hunding's Rage. I used this set before when it was a flat 5% increase, so there's no reason not to use it now that there's a bigger boon to doing so. Traits on the armor lean more toward the armor bonus one, since you end up falling a little short here, and I absolutely hate having to waste a skill slot on an armor active. Infused is also highly viable for the head, chest, and legs (since they have full enchantment bonus). Season to taste with enchantments, making sure you get as close to your health soft cap as possible. If you can cap all three, do so... but if you find you're going to have to choose between magicka and stamina for the other attribute, there are a few things to keep in mind:
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• Your medium armor at 7 pieces (or even six) should provide enough stamina regeneration to make your max stamina a purely damage question.
• If you're opening with Suprise Attack, 1600 - 1900 damage is a lot to pass up. Magicka soft capping here is really really nice.
• You always have leeching strikes to fall back on. Don't be afraid to split your stats since Leeching doesn't play favorites on your pretty colored bars.

Jewelry is harder to gauge. If you're a vampire AND you're not Dunmer, you're going to want a fire resist necklace or ring. You'll also most likely want an armor necklace or ring unless you plan on making fights dicey by healing more. If you're not a vampire, this will free up a jewelry slot. One option would be to go with the Clasp of the Dragon instead of the crest, and use werewolf hide rings and helmet. I recommend this move if you're not a vampire, but you'll want to run with either Immovable on your primary bar, or Shadowy Disguise for it's passive armor increase. The gear below assumes you'll want fire resist, and renders the above option moot.

So we're looking at a gear loadout that resembles this:
Critical Dagger of Night Mother's Gaze with irresistable damage x 2
Boots of the Night Mother's Gaze
Jack of Hunding's Rage
Arm Cops of Hunding's Rage
Guards of Hunding's Rage
Bracers of Hunding's Rage
Belt of Hunding's Rage
Crest of the Dragon
Necklace of Fire Resist
Weapon Damage Ring
Weapon Damage Ring

Your switch weapons are a pair of Claw of the Dragon, which are dual wield swords for the purpose of your twin blade and blunt passive - as well as triggering the ultimate set bonus when you switch bars.

What we've done here is effectively added another set to our loadout, and freed up our ultimate on bar 1 for Soul Harvest. This will provide an even bigger boost to ultimate gain, as well as the now-working 3% MORE to our critical chance! Our bar 1 looks like this:

Suprise attack
Rapid Strikes
Agony
Killer's Blade
Leeching Strikes (invigorating drain if vampire)
Soul Harvest

Your second bar looks something like this:
Power Extraction
Steel Tornado
Rapid Strikes
Refreshing Path
Swallow Soul (invigorating drain if vampire)

For packs of two, simply enter into stealth, approach from the blind side, and open with your surprise attack. Your critical hit percentage, increased weapon damage, and reduced enemy armor is enough to make (two at most) rapid strikes finish them off. It is now a 1v1 battle where Killer's Blade will leave you ready for your next pair and minimal time spent.

For packs of three, the same applies - but take a moment to Agony the third (preferably caster), and save them for last. Don't worry - the fight won't last 12 seconds.

For packs of four, you want to surprise attack the first, agony the second, and check your ultimate counter. Remember - archers and mages are your agony targets. If you have 213 ultimate to spend, swap over to bar 2 and fire off Veil of Blades (devouring swarm if vampire). If you don't, your rapid strikes adds anywhere from 7 to 50 something ultimate per use because it builds on a per strike basis - and your soul harvest will bag you an additional 7 per kill. Finishing off the first mob may be worthwhile to reach ultimate. If you dove into this fight without any ultimate, or you're abushed - rely on a potion and chastise yourself for not paying more attention. You probably still won't die after the vet content level rollback.

For packs of five, you switch to bar 2. Don't bother opening with surprise attack - you'll probably be detected anyway with the pack spacing and you don't want to be bar swapping when five mobs swing on you. Open with Power Extraction, and dodge roll forward or backward. This will nullify any heavy attacks or special attacks that come from the initial agro, and will leave you with enough to: Tornado. Do it again. Do it a third time. This isn't your build from last month where you got sick of Whirling Blades because the mob still had half health after unloading a bar of stamina into it. This is a build that has now surpassed your weapon damage cap, and is boasting a standing 45-50% critical chance. These tornadoes will hurt like the dickens. When you run out of stamina, if there's mobs still standing you've regenerated enough magicka to Swallow Soul them down. Besides... your light attacks here are at 155% weapon damage and with 50% critical.

Bosses come in two flavors. The single dot bosses can be killed without having to rely on any more than a pair of swallow souls at most. Your bar is Surprise attack, Rapid Strikes, Agony (if it's an add boss)/Shadowy Disguise (if it's not), Killer's Blade to execute, and Leeching Strikes to sustain. Since your ultimate won't be building up too fast off of one mob, you can also swap out Soul Harvest for Veil of Blades directly and ignore your second loadout. Open with Surprise attack... if she's stunnable, you can get three rapid strikes in before she comes to: and her health will be almost nil. Finish with Killer's Blade. If she's not stunnable, pop swallow soul on her after the surprise, shadowy disguise yourself to boost your armor through the passive, and unload with those three rapid strikes. If the boss has adds, agony works wonders to lock down. A two dot boss may take too long for agony alone, so activate leeching strikes and pack a lunch. You'll also want another form of healing available, so ditch that agony and plug in refreshing path. Leeching strikes will keep you in resources enough to where you'll become a two dot boss of your own... and your enemy doesn't crit near as much as you do.

I'm not going to go into detail about PvP because I don't know whether or not you Aldmeri scum are out to get me. I can say that an Ambush followed by a rapid strikes with daggers will make a mage squeal like a pig if they didn't see you coming. If they did, you're going to want to dot them up and immovable is your spell resist friend. A tin can DK isn't so bad either with dual armor piercing maces, night mother's gaze, and a metric boatload of critical chance. It's the clothy DKs that will really wreck your day if you don't get the drop on them.