General purpose build, solo'd Zariman steel path.
Since Veilbreaker, has been able to solo both Archon hunts.
For Archon Shards so far, I'm using Strength from the Crimson, and Armor from the Azure.
The flat armor provided by the Azure Shard covers [Xaku]'s defensive hole surprisingly well.
Archon Shards are not necessary to solo any content, but certainly can cover your weaknesses and synergize with your strengths.

I use Molt Efficiency and Molt [Vigor] as arcanes, and all 3 evolving weapons from the Zariman.
Healing via [Healing Return], though you could drop [Streamline] for the [Vampiric Grasp] augment if you wanted to.
Vamp Grasp is very effective if you remember to keep The Lost: [Gaze] active on the battlefield (which you really should)

Personal preference is Zenurik operator for Hardened Wellspring. I notice 100% uptime of all abilities so long as I don't find myself running in to nullifier bubbles. This was achieved by switching off [Vampiric Grasp] in favor of [Streamline].

I dropped [Xata]'s Whisper for Roar as [Streamline] makes it much easier to maintain, and Roar will increase the damage of your 15 void armaments as well as your party, whereas [Xata]'s Whisper does not

Suggested by faironnewarframe:
Use the subsumed ability from [Banshee], Silence, to [Protect] yourself from Eximus abilities.
[Banshee]'s Silence will make the battlefield much easier to control with this build's range, efficiency and duration while [Gaze] and The Vast Untime will maintain high damage application even without Roar.