Naut has some amazing CC and if you Use Dredge line in to riptide and then titans wrath, all you do from there is auto attack. My best game with this build I went 14/11/7, not the best but It still works and it's an alternative to his standard Ap or tank builds.

I get Berserker's greaves because you need boots and they offer you attack speed. I upgrade them with
alacrity to give a flat movement speed bonus.

The reason I get Two phantoms is they stack. Sure some say it's just a waste of space to have two but, it's not!.

I get blade of the ruined king next, I get this because The life steal on this is insane and in my opinion better than bloodthirstier. ruined king's passive is ridiculous and op.

Next I get Frozen mallet, It gives you health and armor So you have better sustain and the passive has a chance for you auto attack to slow. your auto attack already stuns because of naut's passive so they work together.

Lastly I get Sunfire cape. It gives you health and armor for more sustain and it's passive is Pretty cool.

I'll cover abilities. I get the shield first, it gives you sustain and applies a DoT (Damage over time) Effect that can be really annoying at a low level.

I next get dredge line, it helps pull people toward you or your team so you can attack them.

I then get my AoE (Area if effect) Slow. this slow is Okay. It is best used after you dredge line someone or if someone is chasing you.

Lastly I get my ulimate when ever possible. Naut's ulti is amazing at catching up to enemies that are faster or out of range of dredge line, or simply of you miss your dredge line.

My mastery choice is hard to explain. I just get max attack damage, critical strike chance and damage. I also get max attack speed and Coil down reduction, as well as the upgrade fir exhaust.

then there is the armor pen which Ignores a percentage of your enemies armor.

the health regeneration is self explanatory, more health regen equals more survivability.

Ah yes, my runes. First off O have my crit chance runes, they are good for doing crit damage more often.

I then have my flat Attack damage runes, they just give you an extra boost to your attack.

Next is the big ticket item. I have my armor pen quintessences these runes are so deadly its not even funny

Cons:
This build requires skill and is not string until the late game.

the items in this build are expensive.

Pros:
This build will Destroy the enemy team to shreds. you will be getting alot of kills and ***its so you will get fed in no time.

Note: (Pros/Cons may or may not apply depending upon ones skill level) these are pros/cons I've experienced at my skill level.