Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
The Ultimate Dps guide for Rammus. You'll be wanting to get a Malady first as it's attack speed and life leach are unbeatable at low levels, once complete move onto the dodge boots, combined with runes and masteries these will make you extremely fast and hard to kill. For the last 4 items focus on getting sunfire capes as you already have plenty of damage from your abilities these will be the ultimate icing on the cake.