This build aims to improve upon the aim of all the other X-23 builds by using a few twists to the established forumla.

What are these twists?
STEP 1: Grab all the shields but not the Shield of Perseus.
STEP 2: Grab a Cosmic Belt with 10% chance to reset all movement powers and their stacks
STEP 3: ???
STEP 4: Profit

For your Slot 3 which is currently her Unique, it should instead be a Cosmic Belt. You want something with the same Cosmic Item Affix as the one below; (the reason why it's not shown in the above gear set-up is because the cosmic gear on this website hasn't been updated to the latest iteration yet)

Why the Cosmic Battle belt? This is because it is the one unique slot you can replace that won't affect your damage in any significant way and the benefits of the Cosmic belt with the movement proc outweigh the loss in brut/crit rating since you can get that elsewhere. And I almost forgot; the cosmic movement proc, applies 3 stacks to your signature power when it activates! WINNING!

Here's the proof that the Cosmic Affix works:

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VIDEO GUIDE:

POWERS & TALENTS

 

ROTATION:
Crimson Sweep (to apply vuln) -> Dancing Blades x5 -> Cyclone Kick -> Open Jugular -> Rending Leap -> Cyclone Kick -> Dancing Blades x 3 (if the cosmic movement affix procs in this instance then make that x 5) -> Crimson Sweep -> repeat rotation from first Cyclone Kick

• CRIMSON SWEEP:
  A bleed power that allows you to apply vulnerability.

• GRACEFUL MANEUVER:
  Your evade power that makes invulnerable when you use it. It also gives you 10% attk speed and move speed for 6s.

• DANCING BLADES:
  Your signature attack which is pretty much your main spender when you get into the rotation. With the talent, Footwork, you will be able to add 1 charge to this attack on every use of Open Jugular and Cyclone kick.

• CYCLONE KICK:
  Really nice AoE skill that helps you deal with multiple enemies easily. It also feels really good to use.

• OPEN JUGULAR:
  This skill does atrocious damage but the reason why we use it is so that we can access the skill that does crazier damage; Dancing Blades. With the Talent; Footwork, every use of Open Jugular and Cyclone kick will grant you a new stack of Dancing Blades.

• RENDING LEAP:
  With the talent, deadly grace, you can use this skill to reset the other two skills; Open Jugular and Cyclone kick. It does a good amount of damage and is tagged movement which means it also activated the Cosmic movement affix on your Slot 3.

• COVERT ASSASSIN:
  With the talent, Unexpected Recovery, this skill slows you to not only stealth but also grants you incredible regeneration that can outheal most incoming damage. The buff only lasts for 3s though so pay attention to your health.

• TWIRLING LUNGE:
  With the talent, Deadly Grace, this power can also reset the cooldowns of Cyclone kick and Open Jugular. This ability can activate the movement proc on the cosmic slot 3.

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TALENTS:

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• KEEP MOVING: This talent grant you 10% more damage to your movement powers. This includes your signature power which you will be using a lot.

• DEADLY GRACE:
  This talent gives .... a 25% chance to reset open jugular and cyclone kick giving you a faster and smoother rotation when it does.

• UNEXPECTED RECOVERY:
  This talent grants Covert Assassin the ability to heal you for 2800 health per second. This makes this skill quite valuable for survival.

• BLOODY LEAP:
  Grants 50% increased dmg to Blood Harvest and gives it the movement power tag and grants Rending Leap an extra charge. This is chosen so that you have multiple ways to procc the Cosmic affix on your cosmic slot 3.

• FOOTWORK:
  This is chosen because Rending Leap and Deadly Grace synergize well with it. Using Rending Leap resets

INFINITY SYSTEM

• MIND GEM: 150 Points into Mental Focus

• POWER GEM: 20 points in Strike True and 50 into Strike Through. If you can max out Strike Through with your stat distribution then go right ahead!

• REALITY GEM: All points into Potency. We literally spam our signature power in pretty much every spec possible on this character

• SOUL GEM: Nothing needed here.

• SPACE GEM: 20 points into Durability.

• TIME GEM: Put 6 into Speed

GEAR

SLOT 1 - 5 ENCHANTMENTS: SLOT 1 & 5: +50 phys dmg SLOT 2,3,4: +150 defence CHALLENGE BONUS: +1 Speed

• SLOT 1: Fragment of Twilight  : This is mainly used for it's brut rating and crit rating boost. (Where to Acquire: You can get the recipe for this from the vendor in Odin's Palace if you have enough Heroic Commendations or Protector's Commendations or you can get it as a random drop in the Muspelheim Raid when defeating bosses) It can be replaced with  Kirigi's Katana (from any boss) or  Streamsword (from any boss)

 

• SLOT 2: Lord Brimstone's Hide  : This provides the highest amount of damage rating compared to the other gear she could possibly wear. The crazy amount of defence every 30s is also a good benefit(Where to Acquire: The recipe for this can be bought from the vendor in Odin's Palace for Heroic Commendations or Protector's Commendations. Or you could get it from beating the 2nd boss in the Muspelheim Raid). You can replace this with  Portal's Darkhawk Armour (can be bought from Jocasta in the Avengers tower) or  Mzee's Hardened Shell (Recipe can be bought from vendor in Hammer Bay).

 

• SLOT 3: Cosmic Battle Belt with 10% chance to reset movement powers and their charges . Try to get one with the movement reset affix then, try to get one with the movement affix and brut rating then, try to get one with the brut rating, movement affix and 1% increased damage per 50 max spirit. - This is a long journey but it's worth it! (if you're not up for all that noise then you can just use her slot 3 which is the  Kinney Family Locket but then you might as well be playing a different build)

So basically, you want something like this but with a +1 Speed Challenge Bonus:

 

• SLOT 4: New X-men Boots  : This is her Slot 4 Unique. It gives really good damage stats which is why I'm using it. You can swap this for  Skrull Military uniform.

 

• SLOT 5: Fred Dawson's Cap  : This cap is amazing for boosting your damage. Why? It not only gives you 48% more dmg but also gives you a 10% dmg boost for one minute and this applies not just to you but your team also. This is amazing in raids as well because it is a boost that stacks with other buffs and is essential multiplied across each member of the team. Definitely a must have (where to acquire: From Midtown Madness Fortune Cards). Can be replaced with Her Slot 5 or  Cobra's Hood

ARTIFACTS: COSMIC AFFIXES: +1 to all Attributes, 1500 Defence rating

• Glinting Einherjar Brooch: Deals with any crit problems you might have while giving you an amazing amount of damage. (Where to Acquire: From the vendor in Lower Asgard, after doing the event A Sacred Door. The vendor spawns after you successfully defend the door. The door can be found at the far North-west corner of the Lower Asgard map)

 

• Cosmically Enhanced Crossbones Credentials: Used for it's brut rating, crit rating and brutal damage. (Can be replaced with Hand of Doom , Gem of the Kursed,  Edge of Infinity,  Ziggurat of Kargul) (Where to Acquire: From beating Crossbones in any Cosmic Mode)

 

• Advanced Crimson Crystal of Cyttorak: Used for it's damage shielding that can activate when you hit with a power. (You can replace this with  White Suit Jacket, Vibro-Smashers, Sabretooth's Furry mane) (Where to Acquire: If you don't already have this by now, try to get one from defeating any lvl 60 boss in the game)

 

• Advanced Circlet of Cyttorak: Applies a good amount of damage to your X-23 whilst also giving you a chance to gain a 15,000 damage shield which stacks with all your other shields as far as I'm aware and doesn't replace them.(Where to Acquire: From defeating Juggernaut in any mode) It also gives good brut rating. You can replace this with  Advanced Hellfang of Zarathos (from any lvl 60 boss) or  ARMOR Issued Nano-Poison (from Jocasta ARMOR vendor in Avengers Tower).

MEDALLION: -  Madame Hydra

LEGENDARY:

NORN STONES  : This is what I'm currently using and it's mainly used for the Shielding that it provides when you drop below 50% health. The shielding saves your life from large spikes and since it boosts your damage, it allows you to really pump up the damage.

EXCALIBUR  : Gives you a good amount of Defence and regen. Best for increasing both survival and damage without going full Shield of Perseus.

SAVAGE AXE OF ARES: Gives you a good amount of damage alongside it's brut damage, brut rating and crit rating. With all the damage it gives, it also leave you a lot squishier than the above two Legendaries.

RELIC: Atlantis 

RUNEWORD:
The Power Doop  (Where to Acquire: Get this from Moondragon for Cosmic Worldstones. You can get Cosmic Worldstones during the Cosmic Chaos event

INSIGNIA: Quicksilver  (Where to Acquire: From any boss or mob that's willing to let you have it.)

RING: Sling Ring of Kamar-taj  (Where to Acquire: From the Dark Dimensions event) or Midtown Guardian Signet (Where to Acquire: Midtown Monday)

 

TEAM-UP
PASSIVE-WASP 
She gives you a 20% damage boost for 2 seconds every time you use a movement power. You'll be using a ton of movement powers in this build so this is always a nice damage boost.

ACTIVE-SPIDERMAN
Always great for area clearing and taking aggro when you stealth. Incredibly survivable as well.