Rammus is the best tank you can play due to his passive and abilities. He does so well in team fights but sadly, tanks aren't played a lot now. OK ENOUGH SH*T LETS GET ON WITH IT

Passive: spiked shellInfo:Rammus gains additional damage as his shell becomes reinforced, converting 25% of his Armor into Attack Damage.
Thoughts:So building tank on him is a no brainers job.

Q: Powerball
Cost: 60/65/70/75/80 Mana
Range: 300
Info:Rammus accelerates in a ball over 7 seconds towards his enemies, dealing 100/150/200/250/300 (+100% Ability Power) magic damage to nearby enemies on impact, knocking them back, and slowing them by 20/25/30/35/40% for 2 seconds.Activating Defensive Ball Curl(W) will remove this effect after 1 second.
Thoughts:you will want to max this last because the only use for this is entering team fights and clearing jungle camps.

W:Defensive Ball Curl
Cost: 40 Mana
Range: 300
Info:Rammus goes into a defensive formation for 6 seconds, increasing his Armor and Magic Resist by 40/60/80/100/120 and returning 25/35/45/55/65 (+10% Armor) magic damage to attackers.This ability gains damage equal to 10% of Armor.Activating Powerball(q) will remove this effect after 1 second.
Thoughts:This ability is vital in team fights if you want to last long so max it first.

E:Puncturing Taunt
Cost: 50 Mana
Range: 325
Info:Rammus taunts the enemy champion or monster into a reckless assault, reducing their Armor by 5/10/15/20/25 and forcing them to attack Rammus for 1.25/1.5/1.75/2/2.25 second(s).
Thoughts:This is how rammus make so many sick plays. Just use this when your enemy's trade and laugh your *** off on how easy the trade was.

Q:Tremors
Cost: 100 Mana
Range: 375
Info:Rammus creates tremors beneath him, dealing 65/130/195 (+30% Ability Power) magic damage every second to nearby units and structures for 8 seconds.
Thoughts:Just max this as soon as possible. this will help a lot in team fights.

flash: basically an escape.

smite:basic jungle needs.