Hi there, my name is DennyBlue I'm a main Tank Jungler on EUW.
I'd like to share with you my way of playing probably my favorite champion Rammus the Armordillo!
Just some info from my side I'm actually nothing special I'm just an unranked jungler nothing else I play main jungle since s3 on lvl 10 since that I never really left my cozy Jungle.
I just want to bring clarity to a couple of your thoughts first off ^^

Why the heck should i use this Build youre unranked and nothing special.... AND AUSTRIAN!!!
Because what do you have to loose ^^

Why should I play Rammus If I could play Elise Lee sin etc. ?
Because Rammus is in my opinion ONE OF THE BEST TANK JUNGLERS ^^

Do you have kangaroos in Austria ?
No cause its AUSTRIA NOT AUSTRALIA!!!

Thats something you should pick on every Jungler it secures buffs and even kills champions


Youre gonna think why not ghost it speeds you up even more? well just because powerball has its ups and downs and one of the downs is if youre ganking and you even hit a sinle minion u can go back into the jungle because its you main ganking ability and with flash you can get over minions walls or just suprise the enemy.

Mark of Magic Penetration: Rammus does Magic Dammage this rune boots his dammage a bit.

Seal of armor: It does not only give us sustain it gives us dammage because of our passive.

Glyph of scaling Magic Resist: It helps us tank AP dammage till late game.

Quint of Movement Speed: This Rune is just made for an Movementspeed-abusing Champ like Rammus

Passive

Spiked Shell it's what it is a nice dammage increase.

Q

Powerball this is our one-point-wonder throughout the whole game it's one of the most powerful ganking tools you can have always use it to get out of base and into fights plus it's a great escaping tool too.

W

Defensive Ball Curl Ok now i cant say it enough this skill is what makes Rammus a tank on lvl 5 it gives 120 Armor and Magicresist and it returns 55 dammage +10% of our armor to the enemy for 6 seconds it's synergy with Thornmail is like milk and cake if you know what I mean :D

E

Puncturing Taunt This Lady's and Gentlemen is the skill that makes us the ganker and peeler that we are it reduces the targets armor by a chunk and well taunts them you can't ask for better.

R

Soaring Slam Our Ultimate is our Main Dammage Tool it just does so much dammage early on that every time you use this with your gank Combo it should be a safe kill plus it does dammage to structures witch means Towers Inhibs and the enemy Nexus is gonna shatter into peaces if you use this and the cooldown is pretty low too.

Spirit of the Ancient Golem

It's a must have for Tank junlgers you gain: health, Armor (witch means more AD :D) CDR, 25% Health Multiplier, A free ward every 180 seconds and some nice Spike-Dammage.

Boots of Mobility - Homeguard

Isnt it just a good felling to go over 800 MS :D its awesome in ganking and Late Game plus if youre loosing the fast heal up and ms can engage and win team figths.

Sunfire Aegis

It just adds up pretty nicely to our AOE DMG Kit

Thornmail

A Items made for Rammus because its like the big brother of your W you can 1v1 adc's with this.

Zhonya's Hourglass

Gives you a chunk of dammage cause rammus total dammage of his ult scales with 240%AP so only this item means yout ult does nearly 300 more dammage plus the active gives you them engages.

Warmog's Armor

Well not much to say about this but it synergises so good with Spirit of the Ancient Golem because with the multiplier its not 1000hp its 1250hp.

Never get this

Randuin's Omen Frozen Heart Warden's Mail

OK yes its a Tank item but why the heck do people still build this on Rammus its just reducing youre dammage and wrecks the duration on your W i see diamond player's running arround with this but I just DON'T UNDERSTAND IT it's like giving DPS away ._.

Thanks for reading my Guide of playing Rammus pls haver mercy with the rating it's my very first guide and I wrote it in about 1 1/1 hours.
So anyways leave your thoughts on my build in the discussion section but don't worry I will add videos Pictures and other things to this guide time to time.

07.09.2014 Updated the "Runes" Section