Not Updated For Current Season
This is just a quick guide to laning Rammus. I've been playing for a while and used to stick primarily to Carries and Pushers. Some how I found my way towards tanking and bought Rammus on a whim. Now that I've been playing him, he has become my favorite Champion. This build will not make you invincible, no champ is, but intelligent play and teamwork will make you virtually unstoppable.
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Pros / Cons
Ult hits towers
Physical attacks are sent back to enemies
Powerball is a great offensive and defensive ability
Relies heavily on teammates
Doesn't build health typically
Single target taunt
Runes are simple enough, just basic tank runes:
Flat Health Quints.
Can't say much in about this. I typically go with your standard 0/21/9 masteries. I grab the Nimbleness talent as well as additional armor, Veteran's Scars, Tenacity, and Ardor. In the Utility Tree, I take Perseverance, Improved Ghost, Awareness, and put my last point into utility mastery. You could also put the point into Willpower for CDR on Cleanse.
I personally like Ghost and Cleanse. Ghost because it works well with Powerball and Cleanse for obvious reasons; another Get-Out-of-Jail-Free card. It's saved my life more times than I'd like to count. Can't say much more than that.
As with all team comps, grab what is most likely going to be effective in the mid to late-game. For example: Teemo mushrooms getting you down? Grab Banshee's Veil. Yes, they may protect you from only one mushroom, but that extra magic-res can save your life down the line. Not to mention the slight health increase as well as increase to your mana pool.
I start with Shield and one health pot. After farming and hopefully getting an assist or two, kills perferable, I recall and grab basic shoes. These will be built into either Merc's Treads or Ninja Tabi depending on team comp. Chalice of Harmony is your next big item due to the magic-res and MP5 it gives. Thornmail is nice due to its passive and how it stacks well with Rammus' passive. I get it no matter what (comment if this doesn't help you at all)
Next will be FoN for Movement speed and health regen as well as magic-res. Next on your To-Buy list should be Guardian Angel. Lots of armor, bit of magic res, and a potential Get-Out-of-Jail-Free card? Yes please! Most of the time, the game should be winding down, time for your team. Start building towards Frozen Heart (Get it early if you think it would be better suited for your team). Banshee's is situational as is Merc's Treads or Ninja Tabi.
One point into Powerball, followed by Defensive Ball Curl and Puncturing Taunt. Max out Taunt first, your objective is to get your carry fed early on and nothing is more satisfying than dragging an enemy back to your tower so your carry can feast on him. Best feeling in LoL. Next should be Defensive Ball Curl. Put points into Tremors when you can and max Powerball last. Popping your W,E,R early on can net you assists or even kills.
Your job in the laning phase is to taunt enemy carries so that your carry can get fed. Try to initiate with Powerball followed by Defensive Ball Curl and Taunt. If possible, lead them back to your turret for extra damage. At level 6, it is permissible to use you ult for extra damage. In the mid to late game, make sure you have back up when engaging in fights. This is crucial and cannot be stressed enough. Initiate with Powerball, target the carry, and kill that SOB. Using your Ult will damage everyone around you and make your carry's life that much easier. Don't forget to coordinate with your team.
When taunting, try to target the squishiest enemies so that they cannot use their abilities against you or your team. If built right, you will survive roughly anything and help them get taken down. Use Defensive Ball Curl in team fights to avoid damage and to help against lethal tower shots.
Ult buildings and enemy champs to push or force your enemies to retreat back to base. All in all, the rest should be pretty easy; Get the carry fed, avoid stupid mistakes, and don't tower dive unless absolutely necessary (I get lucky sometimes and can nab a kill). I hope this guide helps anyone looking to pick up Rammus and pelase, leave feedback on how I can improve this guide.