Nautilus is a great champion and he really shines in the jungle. He has great ganks with Dredge Line, his E, and his passive stun. He looks badass, and smashes people with an anchor, whats not to love. He also clears the jungle quickly once you hit lvl 3-4. My least favorite thing about Naut is that he is slow. But, I fix this by getting boots of mobility, which help you roam, gank, and clear jungle faster. I play naut as a tanky jungle who is really more of a support. I try to feed my carries, keep my team alive, and tank towers. My job is usually just to feed my team so Top, Mid, and our ADC go nuts. I havn't had the chance to play him in ranked, but I do very well with him in normals.

For runes, I go Greater Glyph of Shielding for blues. The magic resist per level scales well and it basically a staple for late game tanky champs. I go Greater Seal of Resilience for yellows, which is an obvious choice for junglers. For reds, i go Greater Mark of Insight because the magic penetration helps you deal some damage, and if you go all tanky then you wont be able to gank as effectively. For Quints, I go Greater Quint of Fortitude. I like the health, it provides early game sustain, and also lets you tank a little harder with your W.

For masteries, I have the basics really, but I will go into some of my choices. I get Enlightenment over tough skin and bladed because I like the CDR late game and think with a decent leash that you dont need the minion damage. I also get honor guard over initiator because I feel like the movement speed is very situational, and with boots of mobility you can move around fine. Pluss your pull can close gaps. Sometimes I will change my masteries around and go for greed, to try to rush Rod of the Ages faster. But, either works for me. Juggernaut is pretty sweet though.

My items are pretty straight forward. But, I change my build/order depending on the match, which is always good to do. I start cloth pots because I find I need the defense to get started. Get gold per 5 items early, upgrade your boots to Mobos. Then I go for Rod or Agis depending on the situation. I have been getting Malady or Wits end also a lot. The attack speed lets you do a lot of damage with your W and lets you stun each player in a team fight faster. Build wards to help out when you can, sometimes pinking top, or just laying a ward in mid will help your team avoid lots of deaths. One you have Rod and Agis, get oracles if the enemy team is placing a lot of wards around. You can get oracles earlier too, but I wait til I am feel comfy that I wont die often. Dont forget to sell your philo stone or heart late game for a needed item if you dont plan on building them up. Sometimes your support will get them, so you can get some more AP items. Abyssal scepter is a good one. AND definitely think of getting CDR too. Frozen heart is great. Build your items according to what your team needs and what your opponents are doing.

I start with Q, then pop E to slow. Then I activate W for the damage and shield and auto attack to stun. This combo should get a kill or blow a flash if you land Q in a gank. Once you have your ult, you can also start with that. But I usually save it to CC a carry, interrupt an ult, or secure a kill. Keep E-ing while you hunt people down. And use your Q to close gaps, or escape. Q-ing away to terrain has saved me so many times. You should also try to Q in the predicted path of a fleeing opponent, better if its towards terrain, so even if you miss, you are closing the gap by pulling you toward them.

Flash is the best summoner in the game. Most players should get it. Its just so good and versatile. And obviously smite for jungle. Some guides say you can get other skills other than flash, but I think thats just bad. Flash is amazing.

Naut is slow to start. I get W first because it helps stop the bleeding early and deals aoe dmg. If you have a helpful team, start wolves, then blue, then wraiths, then back to wolves, then Red. I usually leave golems for top, or start to get them later in my route. If you just have a leash, start blue, then wolves, then wraiths, then Red. Gank at level 4 once you get Dredge Line, usually mid, but wherever is pushed out is good.

If you follow this guide, you should do well once you get the hang of nautilus. Just play smart and protect your team when you can. Dont be greedy, play more like a support and secure kills for your carrys. If you find yourself getting a lot of kills, try to adjust your build to be more of a damage dealer. Gank when lanes are pushed, ward when possible. Learn to land your Q to gank or escape.