I suggest using:
5 Crimson Archon Shards with ability duration or ablity strength (I like more uptime on abilities, but its a preference thing). Could also use 1 or 2 Azure Archon Shards with armor if no augment.

ABILITIES:
Nourish makes 3 give more energy, in fact, enough to spam 4 as much as you want lmao, insane energy [Regen] for you and your teammates. It also gives viral procs, basically making the slash from 4 twice as powerful, literally the ability meant for Styanax lmao.
At 250 Molt Augmented Stacks, you get 9,27 Energy/Second with 3. Activating Nourish makes this go to 4,09*9,27=37,9143 Energy/regen second lol. Thats almost 40 energy/regen second.
(Will test later)
Not modding shield for his passive, since 20-40% more critical chance is WAY easier to achieve by modding weapons (remember this isn't base) and the mod slots are way better used on [Styanax] for range and strength.

MODS:
[Combat Discipline] to trigger Nourish
[Umbral Vitality], [Rolling Guard] or [Intrepid Stand] (With [Intrepid Stand], slot Power Drift or Aviator in exilus slot)

ARCANES:
Using Molt Augmented and getting 250 kills would result in more energy/second and would also add more damage to the other abilities, especially 4 would benefit from this arcane (from 3.735 to 4,635 damage). But I do understand why people would prefer Arcane Energize, it might be better, it really depends, personally, I like to stay a long time in missions, so I think this is the best choice for me, but it is up you to decide. You could also switch out Molt Efficiency for Arcane Energize instead.

FOCUS SCHOOL:
Madurai for casting speed.

Enjoy! ^^

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