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Matchup

Karthus
Karthus
17%
83%

vs

47.5%

over 177 games

Rammus
Rammus
44%
56%
Very tankyStrong engageHeavy CC

Skill matchup

Build vs Rammus

Build adapted to this matchup

Starting items

Scorchclaw Pup
Health Potion

Core build

Malignance
1Mage
Blackfire Torch
2Mage
Shadowflame
3vs Tank

Standard

Sorcerer's Shoes
4Magic pen
Liandry's Torment
5Mage tank

Summoner spells

31151%
41145%

Anti AD

Plated Steelcaps
4vs AD
Zhonya's Hourglass
5vs AD

Anti Heal

Morellonomicon
6vs Heal

Anti CC

Mercury's Treads
4vs CC

Anti Tank

Void Staff
5vs Tank
Stormsurge
vs Tank
Cryptbloom
vs Tank

DPS

Liandry's Torment
Mage tank
Rabadon's Deathcap
Mage

Other options

Mejai's Soulstealer
80.0% WR5 games
DominationDomination
Dark HarvestDark Harvest
Cheap ShotCheap Shot
Grisly MementosGrisly Mementos
Ultimate HunterUltimate Hunter
SorcerySorcery
Axiom ArcanistAxiom Arcanist
Gathering StormGathering Storm
Adaptive ForceAdaptive ForceHealth Scaling

Power Spikes

Strength by game phase

Early (0-15)
Mid (15-30)
Late (30+)
KarthusKarthus
RammusRammus
Neutral
Neutral
Neutral

Rammus's abilities

Passive, spells and ultimate

Spiked Shell (P)

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

Cooldowns

Cooldowns by spell rank

LevelQWER
312s7s12s–
69s7s12s2m
96s7s12s2m
116s7s12s1m45
166s7s12s1m30
186s7s12s1m30

Playing against Rammus

How to counter and exploit weaknesses

1

Magic damage counters him: Rammus stacks armor but is vulnerable to AP.

2

Do NOT auto-attack him when his W is active: every auto reflects massive damage back to you.

3

His Q can be blocked by minions or any unit — position yourself behind minions.

4

The taunt is targeted but short range: kite him and stay out of E range.

Source: op.gg + LTL Engine · Patch 16.9.1 · May 8, 2026