Here's my main Xaku build, this build can be used for endurance runs and the likes

Range is important because it makes Grasp of Lohk grab more guns and it increases the range of Gaze, which can 100% strip all defenses(shields and armor) when power strength is above 200%, which is achieved here with 2 red ability strength shards.
efficiency is dumped because of arcane energize.

I'm using Health conversion instead of Adaptation because it's essentially the same thing but with health orbs rather than taking damage, which is likely to happen during Steel path or survival runs,
Another later of defense added is shield gating setup with an augur mod and [Brief Respite].

ideal infusions are either Gloom or Ensnare if you're doing Steel Path
more good infusions: Breach surge, Dispensary, Eclipse, Roar, Condamn,Pillage etc

Xaku's gameplay cycle is:
Cast 4 to pause abilities
Cast 3-Gaze on an enemy, making it do an AoE full defense strip.
Cast 2- pull guns that scale off enemy levels, don't be afraid to let the timer run out and grab new, a bit stronger guns when duration runs out.
Cast 4 when broken/ unactive

Enjoy your calcium overdose - D2N13L