Item 0: Spirit Stone
I think this item is really cost efficient if you start
. Since you will most likely be giving blue buffs after 7 minutes to your mid or top laner, you are going to need the sustain from this item so that you can gank and clear early on.
You will later sell this item as you will no longer need the sustain.
Item 0: Sights Wards and Vision Wards
As a support jungler or any teammate in general help your support ward around the map so that you can have map control. Warding is not solely the support's duty it should be a team contribution. Grab a few every time you recall.
Item 1: Boots
You have a choice between
: I love mobility boots on champions such as Maokai, Nautilus, Amumu, etc. because I am super gank oriented when it comes to these junglers. Mobility boots provides presence and map control during the laning phase and the MS boost is just huge to me.
: Swiftness gives you a fair amount of MS and reduces slows, this item is super situational to me. I would rather take Mercury's treads but I would consider it against champions such as Ashe and Sejuani.
: I guess if your into that CDR Naut build. Its a pretty cost efficient item I just dont see me ever having it, since I will have CDR from Frozen Heart, Frozen Fists, and Shurelias Reverie later on.
: I grab this boots sometimes if I am against an all AD team such as Pantheon, Zed, Talon, Khazix, etc. If their team is literally all AD I stack armor along with these boots.
: My second go-to boot. Usually there will be some form of CC on the enemy team and the tenacity really does help you disengage, engage, and get out of alive from CC chains. If the enemy team is Stun, Slow, and CC heavy I really encourage you taking this choice of boots.
Item 2: Sunfire Cape
I really love this item, it stacks with the dot damage that you do with your W and E and allows you to do a ton of damage to jungle camps and ganks early - mid gaming phase. It also provides good health and armor stats that are pretty much required on any tanky initiator.
Item 3: Shurelias Reverie
This team provides good stats, and if you get a philosopher stone early on provides gold to scale into late game. It provides good sustain, good stats, and a decent amount of health. The reason I like this team mid game is because it allows us to get out of bad situations, boost into good team fights, and proc it to get from point A to point B. As you can tell I am a very mobile style jungler and this just adds onto it.
Item 4: Warmogs
The new warmogs, I can literally build it on anyone and become a tanky monster. I have even seen AD carries build it as their 6th item over GA because it provides better stats. I take this item because it just adds to the overall tankiness that Nautilus already has. Its pretty cost efficient as well.
Item 5: Runic Bulwark or Other MR Items
I love this item, it provides literally stats that Nautilus needs. It provides MR, Armor, And Health. I would like to grab this more but if the support needs it because she is too squishy, then take another MR item so that you do not melt to AP damage.
are good choices if your support plans on building a Runic Bulwark.
Item 6: Frozen Heart or Frozen Fists
Both of these items are superb. The first provides CDR, ARMOR, and an awesome passive that reduces damage taken from AD auto attackers. Take this item if 2 or more of their champions are Auto-attack AD champions. If not take Frozen Fists. These items are provide such good stats and an awesome passive. It adds a 5th CC to nautilus. (5 CC's...) No one will be able to run away from all the CC you dish out, and the stats provided by Frozen Fists are pretty similar to Frozen Heart.
As you can see I have a lot more Armor items than AP items, this is because the current meta is that there is much more AD damage coming from teams than AP items. Since everyone stacks warmogs and health these days, many AP bruisers have really fallen off. Due to this, ATM my build is currently centered more around armor and health stacking.
You can take this item situationally as it provides good stats and a decent active that slow enemies in a pretty good radius.
This item provides a very good active and decent MR and Armor stats. Take this item if you are planning on having one last fight to determine the outcome of the game.
Since this is percent based damage, and the proc is double when they are slowed, it is pretty good on Nautilus if your team is lacking damage. Take this if your team doesn't dish enough damage in team fights.
Your support will usually have this, but if not take it early-mid game. It doesn't really scale into late game but it is good against champions like Karthus as the shield will save them. CLUTCH.
The CDR and AP in my opinion is more viable than the health and AD provided by Red elixir. Take the blue elixir first when your build is complete or close to completion. Grab both if you have the money to do so.