I suggest using:
4 Azura Archon Shards with Energy Max. Since [Voruna] is the Warrframe with lowest base energy (tied with [Ash] (Prime)).
1 Crimsom Archon Shard with melee critical damage (or just all 5 ^ its a preference thing)

Im on the edge of slotting [Primed Flow] instead of [Augur Reach]. Then use 5 Crimson Archon Shards with melee critical damage, its just sad that [Voruna] has the tied lowest energy pool.

Build for sustain and heavy attacks. [Voruna] is built to quickly kill enemies to receive huge amounts of energy and health. Utilizing abilities and weapons that group enemies for quick clearing and action-packed gameplay!

ABILITIES:

You can choose to keep the standard ones since 4 got buffed or:
Gloom (urgh always this one, which is why I didn't showcase it on the build)
or [Creeping Terrify] for crowd control (and armor strip if you use augment instead of [Rolling Guard])

Ability 1: Movement speed and invisibility (you lose this if attacking with weapons, but you can still cast abilities (yes even Ensnare).
Ability 2: Apply amazing damage on an enemy through status, this pairs well with 4, since the status will spread when the enemy dies
Ability 3: Activate to regain health and energy from killing enemies (Enemies drop health orbs when the ability is active, and [Equilibrium] gives you energy when picking those up)(This ability will keep itself up if you just keep killing enemies affected by ability 2)
Ability 4: Use on an enemy to group nearby enemies

PASSIVES:

Use passive (hold) 1 for parkour velocity (does stack with ability 1 (same button, just tap)
Use passive (hold) 2 for increased survivability
Use passive (hold) 3 for Heavy Attack efficiency (90% efficiency, so you still lose 10% combo)

MODS:

[Steel Charge] or [Swift Momentum]
[Adaptation], [Quick Thinking] or [Rolling Guard]. ([Quick Thinking] and [Adaptation] can be sustained through 3 and [Equilibrium]) (even though 2 passive makes you immune to status, [Adaptation] will still [Negate] raw damage from my understanding)
Amar´s Anguish for teleport on heavy attack, to combo with^
[Equilibrium] to regain energy from health orbs dropped by enemies thanks to 3. Using a Vulphaphyla companion with [Synth Fiber] allows you to pick up health orbs, even at full health, allowing [Equilibrium] to sustain energy amazingly. (Personally, I use a [Smeeta Kavat] with [Synth Fiber]).

[Rolling Guard] is flex slot. (could use [Creeping Terrify] if you run that subsume)

Ability Strength for 1,
A lot of Ability Range for 2 and 4.

[Archon Continuity] and [Archon Vitality] only give 1 of their bonus stacks when applying 10 status effects on 2. I still slot [Archon Continuity] in the build though, just for maximization.

WEAPONS:

[Argonak] to armor strip: My Build
[Balla] Dagger to go with ^ Vorunas Balla

ARCANES:

Arcane Blessing since enemies killed by your melee will drop health orbs. (we dont need [Combat Discipline], at around 100 kills I had 50 stacks already, it seems you can just pick up the health orbs EVEN with full health.)
Molt Augmented to gain a total of 60% more ability strength (if you [Reach] 250 kills) throughout the mission. (could be swapped out for Arcane Strike)
(we dont use Arcane Energize because of [Equilibrium] and 3)

Primary Dexterity on primary weapon.
Secondary Dexterity on secondary weapon.
(to keep combo duration up, neat in case no enemies are nearby etc.)
You could also use Vazarin focus school instead.

COMPANION:

[Diriga] or Hound for priming. I prefer hound for this setup. (This build is if using no weapons to shoot, on my page there is also a build with [Reinforced Bond]. But we are using [Argonak] for armor strip and relying on melees since this is [Voruna], so I prefer this one. Build Link

Enjoy!