This is my personal [Xaku] build. If you want to use it feel free.

To bring [Gaze] to 100% armor strip you need 200% power strength. We obtain this with Umbral Intensify, The Relentless Lost, and at least 46 stacks on Molt augmented.

-Archon Shards-
Archon Shards are entirely up to personal preference. If you don't want to bother with [The Relentless Lost] you could replace it with [Augur Secrets] and then Run 1 Tau forged crimson shard with 2 normal crimson shards to bring you up to 203% power strength with molt augmented maxed out at 250 kills. you could also run 5 crimson shards to need less molt augmented stacks to [Reach] 200.
Personally, I am going to run 2 Tauforged Amber shards for 90% energy filled on spawn the remaining 3 slots I will fill out as I decide what I need most. they will probably be dumped into duration or cast speed

The most important things when building [Xaku] is getting as much range as reasonable possible and at least 200% power strength.
With this build we [Reach] 265% range which gives you 15 guns with Grasp of [Lohk]. if you were to replace [The Relentless Lost], [Primed Sure Footed], or [Primed Flow] with [Cunning Drift] you could get 16 guns.
I personally would not recommend dropping [Primed Sure Footed] as getting knocked down at the wrong time in steel path can be a death sentence.
As for dropping [The Relentless Lost] you would need to run at least 1 Tauforged crimson shard and 4 normal crimson shards in order to still [Reach] 200% power strength.
If you choose to drop [Primed Flow] you could make up for the lost max energy with some Azure Archon shards.
In the end I personally do not consider [Cunning Drift] worth it, but if you want to get 16 guns those are options to you.