Shadow Knight 2.1 (Post IC DLC)

The general concept here is a stealthy DK assassin.
I have been running this build for a week or so and I'm having fairly good success with it. I originally played a Heavy Armored Spell Damage build in PVP, but that play style is all but dead for Solo/1vX so the move to stamina was inevitable. This setup gives you plenty of mobility around the battlefield, a decent amount of firepower and enough sustain to hold up against 2-4 moderately skilled players.

Gear:
3 x Vicious Serpent V14 - 2 piece bonus adds weapon crit which is good and the 3 piece reduces the cost of feats by 8% and increases your movement speed after killing an enemy... this set is a pain to get (only drops in SO, but is a great utility set providing crit, sustain and speed to disengage after dropping an important member of the opposing army.
5 x Hunding's Rage V16 - Weapon Crit, Stamina & a boatload of Weapon Damage, this set is a must for Stamina damage dealing. This set is craftable, so you can get whatever pieces you need to work around the pieces of Vicious you have.
3 x Endurance V16 Jewelry - I know most would go for the Agility set for the extra weapon damage and I would for PVE, but in PVP I like the extra HP & stamina regen. All three pieces are enchanted with Gold V16 Weapon Damage Glyphs and it makes a big difference.
I use divines on all crafted gear. With the buffs that Mundus Stones received in the last patch this gets the most of a builds potential.

Mundus Stone:
The Serpent (stam regen), other possibilities are The Warrior (Weapon Damage) or The Shadow (Crit Damage).

Rotation - From stealth - Crit Rush -> Petrify -> WB -> [bar swap] -> Ransack -> Reverberating Bash -> (if they are still alive) [Bar Swap] -> WB->WB....
In a more open field encounter where you aren't engaging from stealth you'll want to close the gap with Dragon Scales up, Start on the S&B bar, Shielded Assault -> Ransack -> Reverberating Bash ->[Bar Swap]-> WB->(Petrify whenever their CC immunity is over, this will dry up their stamina really fast.
This setup is for Solo/1vX situations... if you find yourself in a group or heaven forbid in the AP Train, then you swap out the S&B buff/debuff bar for Dual Wield Daggers...
For DW, my bar is Resolving Viggor - Camo Hunter - Retreating Maneuvers - Steel Tornado - Dragon Scales - Bats

Race:
I am an Orc, so I get a 4% buff to Melee damage, extra health and stam.<br/>Bosmer, Redguard, Khajiit and Imperial are all good choices.

Any suggestions are welcome,

Enjoy