Prioritize full clears early to leverage Karthus's superior clear speed and avoid early river fights where Ivern's utility and team support can collapse on you.
Use your global (R) to influence fights after level 6 and punish low-health enemies post-skirmish without needing to be physically present.
Jungle Plan
Cycle camps efficiently to reach your first AP item spike quickly, then leverage your tempo advantage to contest objectives and force Ivern off camps.
Contest Scuttle only when lane priority favors you and avoid direct fights in river without vision or lane support.
Focus on counter-jungling and cross-map camp trades when Ivern commits to buff-sharing or delayed pickups, using your faster clear speed to deny his tempo.
Danger windows
Early game low-health clears and first river entries are vulnerable to Ivern's invade paths; avoid these without lane priority or vision.
Isolated river fights are risky before you reach your first item spike; only contest with lane support.
Forced smite fights around objectives can be lost if you are out of position or lack vision; prioritize vision control to mitigate this risk.
Early game
Start with a full clear path that avoids predictable low-health river entries to reduce risk of Ivern's early invade or buff-share paths.
Avoid contesting first Scuttle unless your nearby lanes have priority and can support counter-ganks.
Use wards to track Ivern's unusual routing and ping lanes to prepare for potential collapses before committing to river fights.
Power spikes
Level 6 (R) enables global damage to finish off low-health enemies; use it after fights start or when enemies are vulnerable.
First AP item significantly increases clear speed and objective damage; use this spike to cycle camps faster and pressure objectives.
Respect Ivern's utility scaling with shields and Daisy knockup in grouped fights, especially post-6, by avoiding extended low-health skirmishes.
Win conditions
Convert your superior full clear speed and scaling into objective control by arriving first and using (Q) and (E) damage to secure dragons and Rift Herald.
Use your global (R) to assist lanes and finish off low-health enemies after skirmishes, increasing map pressure without direct presence.
Deny Ivern's camp pickups and buff-sharing by tracking his pathing and counter-jungling when he delays camps, leveraging your faster tempo to snowball leads.
Tip: For Karthus vs Ivern, read overview, trading pattern, and danger windows first for a fast Jungle lane check.
