卡爾瑟斯 Matchups

Karthus wants enemies who must walk through him or who cannot quickly leave his damage zone. He is less happy when the enemy can interrupt his channel, ignore his final cast, or kill him from outside his threat range before he gets a useful death spot.

Targets Karthus Punishes

• Jinx: Jinx is vulnerable when she has no reset yet and has to stand in the wave or behind her frontline to deal damage. Karthus can throw repeated Qs into her last-hit path, then use Wall of Pain when she steps forward to finish a low target. The clean execution is to hold Snowball or Flash until she commits to auto range, not before; if you die next to her, your passive keeps her trapped in the worst part of the fight. The danger window is after Jinx gets excited from a takedown, because she can kite your team and outrun your corpse damage. If that happens, stop chasing in a straight line and cast Requiem after her defensive tools and shields have already been forced.
• Aphelios: Aphelios is punishable because he often needs a stable position and protection to output damage. Karthus attacks that setup by making the safe backline space unsafe. Look for fights where Aphelios is standing near his support or turret-side choke; Wall of Pain cuts the retreat angle, and Q pressure makes him choose between dodging and attacking. The risk boundary is his burst window when he has strong close-range guns or a peel support beside him. Do not donate an early death in front of him unless your team can follow. If he survives your dive with lifesteal or shields, back off, farm the next wave, and save Requiem for after the support has spent the main save.
• Kog'Maw: Kog'Maw hates being forced to move while trying to fire. Karthus punishes him by placing damage where Kog'Maw wants to stand, especially in narrow ARAM lanes where sidestepping costs him damage time. The best pattern is slow pressure first: Q the minion line, make him dodge sideways, then Wall when he has to walk backward through his own team. The danger window is when Kog'Maw is protected by heavy peel and can shred you before you reach a good death location. If you cannot enter cleanly, play for repeated poke and global cleanup instead of forcing a corpse in the middle of his frontline.
• Jhin: Jhin has strong picks, but he does not enjoy extended ground-control fights. Karthus can punish him after he uses his long-range root attempt or commits to the fourth shot rhythm, because his movement options are limited once the fight starts. Walk at an angle, not straight through the lane, and use Wall of Pain to make his retreat predictable for Q placement. The danger window is when Jhin is allowed to set up from far away while your team is already low; then your Requiem may be too late or interrupted before it matters. Damage control is simple: stay behind minions against his pick tools, preserve health, and only step forward when he is reloading, repositioning, or forced to dodge your frontline.
• Zyra: Zyra controls space well, but she is fragile and usually has to stand near her plants to get value. Karthus can punish that by turning her own zone into a commitment point: if she steps up to root or plant poke, Wall of Pain makes it harder for her to leave, and your Qs pressure both her and the area around her setup. The risk is walking through plants and crowd control before the fight actually starts, because you can lose too much health and die too far away from the real targets. If she wins the first zone battle, do not force through it. Clear what you can, wait for her control spells to miss or be used on someone else, then re-enter when she has less space to kite.

Threats That Punish Karthus

• Sivir: Sivir punishes Karthus because her spell shield can deny a key hit or block Requiem for herself, and her team speed can turn your slow forward pressure into a bad overextension. If you cast Requiem while Sivir is calm and holding her shield, you may waste your biggest finisher on the target most ready for it. The execution against her is to bait the shield with Q, Wall pressure, or teammate poke before committing to the global cast. The danger window is when Sivir starts a teamwide run-down and your team is spread; you may die in a useless position. Damage control is to retreat early, keep your death near your carries, and force her team to fight inside your passive instead of chasing freely past it.
• Soraka: Soraka punishes Karthus by reducing the value of delayed damage and by threatening his channel with silence. If she is alive, healthy, and positioned safely, Requiem often becomes a setup tool rather than a guaranteed cleanup. You need to watch her defensive timing: pressure her first, force healing or silence, then cast when she is unable to comfortably answer every low-health ally. The danger window is standing still to channel while Soraka still has silence available in range; that can ruin the play completely. If she keeps denying your finish, shift your target priority. Dive or poke Soraka herself, or wait until your team has already forced multiple enemies low enough that her healing cannot cover everyone.
• Xerath: Xerath punishes Karthus from a range where Karthus cannot easily trade back. If Xerath is allowed to free-cast, Karthus loses health before he can enter Wall or Defile range, which makes every future death less threatening. The correct response is not to walk straight at him through open lane. Use minions, side angles, and allied engage to make him cast defensively. The danger window is after your team gets chunked and starts backing up; Xerath can keep firing while you have no good way to start. Damage control means preserving health until a real engage appears, then committing hard once Xerath has used his stun or major poke pattern, because a dead Karthus near Xerath is far more useful than a half-health Karthus being farmed at max range.
• Fizz: Fizz punishes Karthus through target access and untargetable timing. He can dodge key damage, avoid Requiem for himself if timed well, and dive past the frontline to kill Karthus before Karthus chooses the fight location. Against Fizz, do not waste all pressure on the first target he shows you. Hold a defensive angle and make him enter through your team, then drop Wall of Pain where he must land or retreat. The danger window is after Fizz has tagged someone and your team panics backward; if you channel then, he may cancel or kill you before the cast matters. Damage control is to accept a defensive death if needed, placing your passive between Fizz and your carries so his escape route runs through your damage.
• Vladimir: Vladimir punishes Karthus because he can sustain through chip damage, dive into the same clumped fights Karthus wants, and avoid important damage with his untargetable window. If you cast Requiem while Vladimir still has a clean defensive answer, he can ignore the threat and keep fighting. The better plan is to track when he has already used his pool or committed deep enough that leaving costs him position. The danger window is a stacked teamfight where Vladimir enters after Karthus has already died too far forward; he can heal through the corpse damage while your backline collapses. Damage control is to spread slightly before his engage, hold Wall for his exit path, and use Requiem after his defensive timing is gone rather than as the first button of the fight.

In practice, Karthus counters positioning mistakes more than specific champion names. He punishes immobile carries, greedy backliners, and divers who must stay near his corpse. He struggles most when the enemy can deny Requiem, interrupt the channel, or fight from beyond his reach without giving him a useful death spot.