A relatively simple build for [Xaku]

[Xaku] is best used for maximum ability duration, better duration can almost guaranteed be achieved, but this build is meant to be pretty simple and short...

Why the mods in place then:

[Xaku] needs higher health because they do not have armour like other frames tend to, and instead have a "dodge" chance so being hit will actually do some damage usually, you need high duration to use [Xaku]'s best combo, use their [Xata]'s Whisper ability to give yourself a small damage boost of sorts, then find a group of enemies and use Grasp of [Lohk], the more the better, then as soon as Grasp of [Lohk] is used you then use The Vast Untime. The reason to use this combo if you do not know, is that Vast Untime pauses the timer on the other abilities, and having them active gives [Xaku] a big buff, because otherwise they are just a frame that can "dodge" shots. The 3rd ability is largely replaceable with something more useful if you want to use Helminth but per this build, it isn't necessary...

As for the Arcanes, those are something that are nice to have, but not necessary and I more or less threw in as a bit of a bonus...