Hello there and welcome to my first build!
The way I have formaed is to make other builds possible! If your sole purpose with [Nezha] is to be immortal feel free to forma differently.

As you may have guessed, this build focuses on tanking mainly in survival missions.

The way this synergizes is quite simple.
How to use:
Press 4 to impale
Press 2 to either kill or greatly debuff enemies (note: hitting an impaled enemy splits the frisbee into two and with reaping, each frisbee will multiply in damage every time that happens!)
Enemies killed by 4 + 2 + melee/pirmary/secondary kill drop extra health and energy so you'll never run out of energy or health with 130 eff.
Health orbs always keep [Health Conversion] up at x3 which translates to 2561 additional armor combined with [Valkyr]'s warcry. (note: make sure to use [Synth Fiber] on your pet! It allows you to always pick up health orbs, even when on full HP, allowing you to practically always have the max additional armor)
You may want to swap out the 1st ability like I did for [Valkyr]'s Warcry. I did this to test around because I found myself rarely using Fire Walker on this particular build.
Same for the 2nd arcane.
Anyways, enjoy not dying Tenno!
Feel free to make changes and make suggestions. There is always room for improvement