Pros / Cons
Aoes with ulti and sunfire
Good escaping and chasing skills
No ranged attack
Well first buy boots of speed try to make the first kill so you can buy ninja tabi.Second the sunfire cape, you can gain gold more quickly by farming and also kill enemies faster. Thornmail is for better defence and also thanx to ramus pasive you gain 25 extra damage and the 30 returned damage. Finally the randuins omen to become the ultimate tank and slower. The next items you buys is up to you. You can buy either Force of nature or Guardian angel.
How to play as Rammus
First be carefull rammus is not a tank at first try to get the first kill the assist so you can buy ninja taby.After geting W you can tank a lot more.Always use Q then W and ulti if he try to escape use your taunt. When they came closer to your tower use taunt and exhaust you will kill them easily.If there is any stuner dont use Q because you cant use W and die faster.
Well in if you have the sun fire cape and thornmail you can kill anyone in seconds so, in team fights just go with W and R to the center of the battle and they will all die trust me, focus your attacks on the tank your aoes will kill squishy ones and use R to lower tanks armor. Finally you can tank tower obiously.
In team fight all you have to do is jump in the fight use w and r. If someone is attacking your squishy ones just taunt them and then use q to slow them and give the squishy the chance to scape. When the team fight started try to taunt any caster to disable him.
Most of the times i play 3vs3 i solo, is easy if you fight a dps just W and E if he try to escape. If the enemy is a caster use Q and then taunt him as fast as you can he will die id not run. They wont push you or tower dive Rammus because of his taunt if he is near tower taunt him and tower will deal a good quantity of damage. If the round takes to long and you are bored jungle and push them. I never lost a a 3vs3 match with rammus is perfect because he can kill 3 champions late game by himself.
If you are fighting a team with 2 or 3 mages buy force of nature and banshees veil this will protect rammus but they will deal a good quantity of damage buying another item of magic res. is useless because they doesnt give Rammus to much magic res.