Good patterns
- Uses spells to shape space, punish predictable movement or control an approach.
- Ranged basic attacks can contribute without entering melee distance when spacing is preserved.
Game patch 26.20Data Dragon 16.20.1
Reference patch 16.20.1
Karthus
the Deathsinger
Karthus is a spell-focused champion who plays around range, cooldowns and controlled areas. This overview keeps the explanation practical and leaves patch-sensitive numbers to Riot's structured data and the current in-game tooltip.
Usual roleJungle◆ClassMage
7DifficultyMedium · 7/10
◎Basic attacksRangedRanged basic attacks · 450 range.
◈Damage profileMostly magic damageMost normal kit pressure is magic. Magic resistance may help, but control, penetration and true damage still matter.
#Reference patch16.20.1
Strengths and limits
What Karthus does well, and what can go wrong
These are kit-level patterns, not a promise that every lane or matchup plays the same way.
Limits to respect
- Important pressure falls while key spells are unavailable or miss their intended area.
- Needs the player to respect cooldowns, resources and the opponent's route into the fight.
Riot ally tips
Use these while learning the championAsk your allies to help point out when you should use Requiem to get kills in different lanes.
Lay Waste is very strong at farming minions and harassing enemy champions.
Riot opponent tips
What an opponent is told to watch forKarthus can cast spells for a short duration after he is killed. Move away from his corpse to be safe.
Make sure you always have enough health to survive Requiem, even if you have to go back to the base more frequently to heal.
Practical champion reading
How to read Karthus in a real fight
Use these patterns to ask better questions before choosing an item, target or commitment. They describe the kit, not a guaranteed result.
Primarily magic pressure
Magic resistance can reduce the broad spell profile, but positioning and cooldown tracking still decide whether the important abilities connect.
Track the complete ability cycle
Do not judge the champion from one button. Watch which setup, payoff and escape tools are available before choosing a trade or commitment.
Spacing protects repeated output
Ranged attacks are useful only while a safe line to the target remains. Flanks, hard control and blocked escape routes can remove that advantage quickly.
Shape the fight with spell timing
Use range, controlled space and cooldown order to make the next action easier for the team rather than spending every spell at once.
Identify the exact movement restriction
Tenacity can shorten only eligible control. Displacements, airborne effects and repeated slows need their own positioning, blocking or movement answer.
Do not buy a counter that has no target
Reserve anti-heal and anti-shielding for a visible problem in the full team composition; they are not default answers to every champion.
Mana and cooldowns both matter
A spell being available does not mean the complete sequence is sustainable. Watch the resource bar as well as the setup and escape cooldowns.
Defensive item reference
What can help against Karthus?
Start with the threat that is actually affecting the match. These are conditional comparisons, not an automatic counter build.
DEFENSIVE BOOTS
Mercury's Treads usually fit better
Magic resistance addresses the broad damage profile, while Tenacity can shorten reducible control.
Choose Plated Steelcaps instead only when physical basic attacks from this champion or the rest of the team are the larger repeated threat.Normal Draft and Ranked role map
Where Karthus fits on Summoner's Rift
Each lane is assessed separately. Open a role to reach its queue-specific build and matchup preparation.
TopUnestablished route
Historical reference. Recommendation review pending. Karthus is normally played Jungle and does not currently have a reviewed Top route. Top usually needs independent laning, durable trading or reliable side-lane pressure. Treat this as a deliberate experiment, not a standard recommendation.
JunglePrimary role
Historical reference. Recommendation review pending. Karthus has an established clear and map plan that can function without lane income while contesting camps and objectives.
MidUnestablished route
Historical reference. Recommendation review pending. Karthus is normally played Jungle and does not currently have a reviewed Mid route. Mid usually needs solo-lane safety plus wave control, roaming or reliable burst pressure. Treat this as a deliberate experiment, not a standard recommendation.
BotSecondary
Historical reference. Recommendation review pending. Karthus has a secondary role listed in this historical reference. It is less common than the primary roles, but it has a recognisable role-specific plan.
SupportUnestablished route
Historical reference. Recommendation review pending. Karthus is normally played Jungle and does not currently have a reviewed Support route. Support usually needs useful engage, peel or utility while operating on low gold income. Treat this as a deliberate experiment, not a standard recommendation.
Situational AP purchase
When should you buy anti-heal?
Buy healing reduction when enemy healing or regeneration is deciding fights and you can keep damaging the relevant target. Grievous Wounds reduces healing; it does not reduce shields, magic damage or crowd control.
Start with the component
Oblivion Orb can provide healing reduction without immediately paying for a completed Morellonomicon. Fit the component around your core damage, mana and survival needs; check the current queue's item tooltip.
Finish when it fits the fight
Complete Morellonomicon when its stats and slot efficiency suit your build. Do not treat it as a mandatory first item just because your champion deals magic damage.
Coordinate coverage
Multiple Grievous Wounds sources do not add their percentages together. Another reliable applier may cover the same target, but you may still need your own source for a separate fight or target.
Repeated spell damage and damage over time can maintain coverage more reliably than a single hit. Match the purchase to your actual spell access, enemy sustain and the teammates who can apply the debuff.
Will the fight last long enough?
If you die before dealing damage, you apply no healing reduction. If your target dies before healing, there is little healing to prevent. The debuff applies on qualifying damage immediately; it does not need to build up. It remains briefly after your last hit, so teammates can benefit even after you disengage.
Only healing during the active debuff counts. For example, 40% reduction prevents 80 of a 200-point heal, or 400 of a 1,000-point heal, before other modifiers. Compare that with the damage, penetration or survival you delayed; neither example guarantees a kill. Healing after the debuff expires is unaffected.
See the Oblivion Orb and Morellonomicon references for current effects and queue availability. These are situational decisions, not a measured best-build claim.
Kit reference
Karthus abilities
Ability names, descriptions and numeric fields come from Riot Data Dragon. Practical reads are independently written; the current in-game tooltip remains authoritative.
Abilities Data Dragon 16.20.1Cooldown / Cost / Range Data Dragon 16.20.1
P
Passive
Death Defied
What it doesUpon dying, Karthus enters a spirit form that allows him to continue casting spells.
Practical readDeath Defied is the always-on rule shaping Karthus's normal trading and fight pattern. Watch its in-game state before committing.
Q
Q ability
Lay Waste
What it doesKarthus unleashes a delayed blast at a location, dealing damage to nearby enemies. Deals increased damage to isolated enemies.
Practical readLay Waste contributes damage. Its value changes with cooldown, range and target access; recognise the setup before moving into its effective area.
Cost20/25/30/35/40Listed range875 units
W
W ability
Wall of Pain
What it doesKarthus creates a passable screen of leeching energy. Any enemy units that walk through the screen have their Move Speed and Magic Resist reduced for a period.
Practical readWall of Pain is part of Karthus's W pattern. Read its listed effect first, then track the cooldown and condition that make the next use valuable.
Cooldown15 secCost70Listed range1000 units
E
E ability
Defile
What it doesKarthus passively steals energy from his victims, gaining Mana on each kill. Alternatively, Karthus can surround himself in the souls of his prey, dealing damage to nearby enemies, but quickly draining his own Mana.
Practical readDefile contributes damage. Its value changes with cooldown, range and target access; recognise the setup before moving into its effective area.
Cooldown0.5 secCost30/42/54/66/78Listed range550 units
R
Ultimate
Requiem
What it doesAfter channeling for 3 seconds, Karthus deals damage to all enemy champions.
Practical readRequiem contributes damage. Its value changes with cooldown, range and target access; recognise the setup before moving into its effective area.
Cooldown200/180/160 secCost100Listed range10000 units
Cast commitment
This cast has a wind-up, charge or channel. Movement, interruption or a changing target state can matter before the effect completes.
Levels 1–18
Karthus · Health / Mana · Abilities
Base values exclude items, runes, temporary buffs and mode-specific modifiers. Cooldowns are the listed base cooldown before ability haste.
Cooldown Data Dragon 16.20.1
Basic abilityLay Waste
Can receive its first point from level 1. Later ranks normally become available at levels 3, 5, 7 and 9.
CooldownRead current tooltip
Basic abilityWall of Pain
Can receive its first point from level 1. Later ranks normally become available at levels 3, 5, 7 and 9.
All ranks15 sec
Basic abilityDefile
Can receive its first point from level 1. Later ranks normally become available at levels 3, 5, 7 and 9.
All ranks0.5 sec
UltimateRequiem
First rank becomes available at level 6; later ranks normally become available at levels 11 and 16.
Rank 1200 secRank 2180 secRank 3160 sec
Open every levelHealth and mana from level 1 to 18
| Level | Health | Mana | Ability milestone |
|---|---|---|---|
| 1 | 620 | 467 Mana | Choose the first basic ability |
| 2 | 699 | 489 Mana | Add another basic ability or rank |
| 3 | 782 | 513 Mana | Add another basic ability or rank |
| 4 | 869 | 537 Mana | Spend one ability point |
| 5 | 960 | 563 Mana | Spend one ability point |
| 6 | 1,055 | 589 Mana | First ultimate rank normally available |
| 7 | 1,153 | 617 Mana | Spend one ability point |
| 8 | 1,255 | 646 Mana | Spend one ability point |
| 9 | 1,361 | 676 Mana | Spend one ability point |
| 10 | 1,471 | 707 Mana | Spend one ability point |
| 11 | 1,585 | 739 Mana | Second ultimate rank normally available |
| 12 | 1,703 | 772 Mana | Spend one ability point |
| 13 | 1,825 | 806 Mana | Spend one ability point |
| 14 | 1,950 | 842 Mana | Spend one ability point |
| 15 | 2,079 | 878 Mana | Spend one ability point |
| 16 | 2,212 | 916 Mana | Final ultimate rank normally available |
| 17 | 2,349 | 954 Mana | Spend one ability point |
| 18 | 2,490 | 994 Mana | Spend one ability point |
Choose the next question
Turn the profile into a pre-game plan
Choose a queue-aware build, compare a lane opponent, or return to the full champion library.