
Vanguard · magic (AP) damage
Later items show higher win rates partly because games that last that long are usually already being won. Compare items within a slot, not across slots.
Resolve
Grasp of the Undying
Aftershock
Guardian
Demolish
Font of Life
Shield Bash
Conditioning
Second Wind
Bone Plating
Overgrowth
Revitalize
Unflinching
Precision
Press the Attack
Lethal Tempo
Fleet Footwork
Conqueror
Absorb Life
Triumph
Presence of Mind
Legend: Alacrity
Legend: Haste
Legend: Bloodline
Coup de Grace
Cut Down
Last Stand

Based on 2,969 games · 52.7% win rate · High elo · patch 26.20.
Later items show higher win rates partly because games that last that long are usually already being won. Compare items within a slot, not across slots.
Resolve
Grasp of the Undying
Aftershock
Guardian
Demolish
Font of Life
Shield Bash
Conditioning
Second Wind
Bone Plating
Overgrowth
Revitalize
Unflinching
Precision
Press the Attack
Lethal Tempo
Fleet Footwork
Conqueror
Absorb Life
Triumph
Presence of Mind
Legend: Alacrity
Legend: Haste
Legend: Bloodline
Coup de Grace
Cut Down
Last Stand

Based on 93 games · 49.5% win rate · High elo · patch 26.20.
Later items show higher win rates partly because games that last that long are usually already being won. Compare items within a slot, not across slots.
Resolve
Grasp of the Undying
Aftershock
Guardian
Demolish
Font of Life
Shield Bash
Conditioning
Second Wind
Bone Plating
Overgrowth
Revitalize
Unflinching
Precision
Press the Attack
Lethal Tempo
Fleet Footwork
Conqueror
Absorb Life
Triumph
Presence of Mind
Legend: Alacrity
Legend: Haste
Legend: Bloodline
Coup de Grace
Cut Down
Last Stand

Based on 67 games · 49.3% win rate · High elo · patch 26.20.

Rammus gains bonus Attack Damage scaling with his Armor and Magic Resistance.

Rammus accelerates in a ball towards his enemies, dealing damage and slowing targets affected by the impact.

Rammus goes into a defensive formation, vastly increasing his Armor and Magic Resistance, and returning damage to enemies that attack him.

Rammus taunts an enemy champion or monster into a reckless assault against him.

Rammus hops into the air and slams down at a target area, dealing magic damage and slowing enemies. If cast while Rammus is in Powerball, Rammus knocks up enemies near the center as well.
Q Powerball
R Soaring SlamTaunttenacity helpsFROM
E Frenzying TauntSlowignores tenacityFROM
Q Powerball
R Soaring SlamSome of their lockdown (airborne) ignores tenacity, so you dodge it; you can't cleanse or Merc' through it.
Tap or hover a crowd-control type to see which ability it comes from.