Game patch 26.20Data Dragon 16.20.1

Reference patch 16.20.1

Karthus Jungle · Normal Draft

Karthus has an established clear and map plan that can function without lane income while contesting camps and objectives.

Primary roleStandard Summoner's Rift preparation

Champion overview

Historical referenceRecommendation review pending

These patches track recommendation review, build validation and item lookup separately. Updating item data does not complete a build review.

Recommendation patch: 16.16 Data Dragon
Build validation patch: 16.19.1 Data Dragon
Item lookup patch: 16.20.1 Data Dragon

Normal Draft · Jungle

Reviewed Karthus clear Jungle

Follow the completed-item order as a pre-game reference. Components and owned items do not create extra inventory slots.

Primary role

Draft / Ranked opening · separate from item 1

Gustwalker Hatchling

450 gold

Provides Smite progression and the movement-focused Jungle companion.

First item

Blackfire Torch

2,800 gold

Adds mana and repeated spell damage in sustained fights.

Boots

Sorcerer's Shoes

1,100 gold

Adds flat magic penetration against low-resistance targets.

Core

Shadowflame

3,200 gold

Improves magic damage against low-health targets.

Second core

Rabadon's Deathcap

3,500 gold

Multiplies ability power after the functional core is complete.

Late defence

Zhonya's Hourglass

3,250 gold

Adds armour, ability power and a player-timed stasis.

Flexible

Void Staff

3,000 gold

Adds percentage magic penetration after enemies buy meaningful resistance.

Complete build choices

Choose the route before play

Recommendation review pending

AlternativeToo much healingMorellonomicon applies anti-heal. Buy it earlier only when healing is already deciding fights.

View full route

Best when: Morellonomicon applies anti-heal. Buy it earlier only when healing is already deciding fights.

First itemBlackfire Torch
BootsSorcerer's Shoes
Morellonomicon
Second coreRabadon's Deathcap
Late defenceZhonya's Hourglass
FlexibleVoid Staff

AlternativeOne spell stops meBanshee's spell shield can protect the first important cast against you.

View full route

Best when: Banshee's spell shield can protect the first important cast against you.

First itemBlackfire Torch
BootsSorcerer's Shoes
CoreShadowflame
Banshee's Veil
Late defenceZhonya's Hourglass
FlexibleVoid Staff

Runes and summoner spells

Runes and summoner spellsKarthusJungle

The AP Jungle page rewards completed spell-damage windows after a safe clear. Smite remains mandatory; the movement spell protects pathing and gank exits.

Normal Draft

Primary tree

Domination

Dark Harvest

Sudden Impact

Grisly Mementos

Ultimate Hunter

Secondary tree

Sorcery

Transcendence

Waterwalking

Summoner spells

Flash

Smite

Keep Smite

Smite is part of Jungle companion progression and objective security. The movement or combat spell beside it is the adjustable slot.

Change the movement spell

Ghost can fit sustained access; Flash can fit one immediate reposition. Use the champion's route and intended fights to choose.

Static alternatives

Compare the problem before changing the plan

These choices are not selected from live scores. Use one only after you identify the stated match problem yourself.

Only when enemy healing is deciding fights

Oblivion Orb

Oblivion Orb supplies healing reduction without committing to a completed Morellonomicon. Skip both when healing is not the problem or an ally already covers your target reliably. Healing reduction does not reduce shields.

Conditional component, not a core item. Complete Morellonomicon only when its stats and slot efficiency justify delaying another purchase.

One spell stops me

Banshee's Veil

Banshee's spell shield can protect the first important cast against you.

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

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 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 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 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

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.

Adapt the plan

What to do when the game changes

Judge the whole lane or map state, not only personal kills. Choose the situation closest to the current game.

Even plan

Keep the clear moving and choose high-information plays

Pathing

Track opposing camps and lane states instead of forcing the first visible target.

Map play

Trade sides of the map when contesting would require weaker lanes to move first.

Fights

Save important control for the enemy who threatens your carries or objective access.

Pings, movement and objectives

Karthus Jungle map plan

Link each clear to the next informed decision. Pings should tell lanes where you are pathing and whether the team is contesting or trading an objective.

Ahead

Turn tempo into controlled territory

Ping: Use On My Way before entering a lane, Assist Me before an objective and Danger when nearby lanes cannot move to an invade.
Path or gank: Gank when the lane has reach, damage and a safe exit. Do not wait beside a protected target while camps and the next objective disappear.
Objective: Establish vision with the nearest winning lane, keep Smite available and avoid chasing away from the objective after gaining control.

Even

Choose the play with the clearest information

Ping: Use On My Way early enough for the lane to prepare, Assist Me only when nearby lanes can move, and Retreat when the contest has already become late.
Path or gank: Prefer a lane with crowd control, damaged opponents or a favourable wave. A visible opponent is not automatically a usable gank.
Objective: Check Mid and Bot priority before Dragon, or Mid and Top before Herald. Set a safe entrance before beginning the objective.

Behind

Trade the map instead of forcing recovery

Ping: Ping Retreat from lost contests, Danger on likely invades and On My Way when covering a vulnerable lane or remaining camp.
Path or gank: Counter-gank or help only when allies can survive until arrival. Repeated low-chance ganks deepen the camp and level deficit.
Objective: If entry is unsafe, trade for camps, a wave, vision or the opposite objective. Keep Smite and crowd control for a contest the team can actually reach.

Objective setup

Four calls, in order

Pings create a shared plan; they do not replace checking waves, vision and who can move.

1
Before the route
Decide which camps lead toward the objective and ping the nearby lanes before they spend the wave or recall timing.
2
Check priority
Confirm which nearby lanes can move first. Do not convert an isolated objective marker into a forced fight.
3
Control entry
Move with a teammate, sweep one entrance and keep Smite available before committing damage to the objective.
4
Finish or turn
Call whether the team is finishing, fighting or leaving. Mixed decisions are more dangerous than either clear choice.

Later objectives: Repeat the same process around later major objectives: handle nearby income, communicate the route, enter through vision and agree on the fight before committing.

Use the guide

Put Karthus into a real matchup

Compare a specific opponent, return to the champion overview, or choose another champion without losing the queue distinction.

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