This is a full Melee Voruna Build!

Guandao Prime build to go with Voruna: https://overframe.gg/build/398232/

For Aura, we use [Steel Charge]. DE has made it clear [Voruna] is meant to be a Melee frame, so we will capitalize on that with the higher polarity [Steel Charge].

We run two Umbral Mods for Max Survivability. [Voruna] loves all of the stats this gives her. We also run [Health Conversion] for the massive amount of armor this can give our very active playstyle.

We run [Narrow Minded] and [Primed Continuity] in order to get maximum value out of our buffs, Shroud of Dynar and Lycath's [Hunt]. Shroud of Dynar gives us invisibility, while Lycath's [Hunt] gives us guaranteed Health and Energy Orb drops. Due to this, we don't run [Streamline] or Arcane Energize since we'll be getting all we need from our own abilities.

We run [Stretch] and [Cunning Drift] to make sure that we can still hit all of our enemies with our abilities.

Adaption and [Equilibrium] gives us more survivability, as well as fulfills all our energy needs by turning our Health pickups into energy pickups. This means that we will almost never run out of energy as every single Health Pickup from our Melee kills becomes an energy pickup also.

Arcane Blessing gives us a huge boost in Health should we need it, and Arcane Avenger gives all our weapons bonus crit chance.

For Archon Shards, invest into Crimson Shards for Ability Strength, all the way. This brings us up to 200-250% Ability Strength. If you don't feel you need the Ability Strength, then the next best option would be Amber Shards for Health Orb effectiveness, OR Azure Shards for Energy Max.

All in all, [Voruna] is an amazing Buffing tank, that I think will quickly end up as a great addition to any squad with this loadout. Overframe doesn't show this properly, but with [Health Conversion] and Arcane Blessing, [Voruna] can have over 12,000 Effective Health Points. Enjoy!

Helminth:
If you Want to Helminth anything, I'd recommend doing so over her 4th ability. Notable Helminth Abilities include Silence, Resonator, Gloom, Warcry and Roar. I would personally recommend Roar out of all of them.

UPDATE FOR ABYSS OF DAGATH:
With Auto-Melee and the companion changes, [Voruna] is now a way better warframe than she ever was before. You no longer need to take [Synth Fiber] on your Companion in order to get health orb drops at full health as long as you have [Equilibrium] or Health Conversation equipped!