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Matchup

Karthus
Karthus
17%
83%

vs

52.0%

over 609 games

Sylas
Sylas
27%
73%
Heavy AP damageHigh burstDive threatHigh sustain

Skill matchup

Build vs Sylas

Build adapted to this matchup

Starting items

Scorchclaw Pup
Health Potion

Core build

Dark Seal
1
Blackfire Torch
2Mage
Shadowflame
3vs Tank

Standard

Sorcerer's Shoes
4Magic pen
Rabadon's Deathcap
5Mage

Summoner spells

31151%
41144%

Anti AD

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

Anti Heal

Morellonomicon
6vs Heal

Anti AP

Mercury's Treads
4vs CC
Banshee's Veil
5vs AP

Anti Tank

Void Staff
5vs Tank
Stormsurge
vs Tank
Cryptbloom
vs Tank
Bloodletter's Curse
vs Tank

DPS

Rabadon's Deathcap
Mage
Liandry's Torment
Mage tank
Malignance
Mage
Horizon Focus
Mage
Actualizer
Mage
Rylai's Crystal Scepter
Mage tank

Other options

Mejai's Soulstealer
Rod of Ages
HP
76.9% WR13 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
SylasSylas
Passive
Favorable
Favorable

Sylas's abilities

Passive, spells and ultimate

Petricite Burst (P)

After casting a spell, Sylas stores a charge of Petricite Burst. Sylas's basic attacks will expend a charge and whirl his energized chains around him dealing bonus magic damage to enemies hit. While Sylas has a charge of Petricite Burst, he gains attack speed.

Cooldowns

Cooldowns by spell rank

LevelQWER
310s12s13s–
68s12s13s1m20
96s10.5s13s1m20
116s9s13s55s
166s6s11s30s
186s6s9s30s

Playing against Sylas

How to counter and exploit weaknesses

1

If your ult is powerful (Malphite, Amumu, Cho'Gath), wait until Sylas has already stolen it and it's on CD before fighting.

2

Ults that scale with AD are less effective for Sylas since he builds AP — his ult steal is weaker against AD ults.

3

Sylas is relatively weak in early game: punish him before he steals an ult that changes the fight.

4

His E2 is a linear skillshot: side-step to avoid the dash + knockup.

Source: op.gg + LTL Engine · Patch 16.9.1 · May 9, 2026