Prioritize full clears early to leverage Karthus's superior clear speed and avoid early river fights where Sejuani's engage threatens you.
Focus on scaling through efficient jungle tempo and avoid early duels; your global (R) lets you impact fights without direct presence.
Respect Sejuani's level 6 engage and avoid isolated river skirmishes where her CC chain and tankiness can punish you.
Jungle Plan
Focus on cycling camps quickly to hit your first AP item spike before contesting objectives or invading.
Contest dragon and Rift Herald only when you have vision control and nearby lane priority to avoid Sejuani's CC setups.
Use cross-map pressure and counter-gank timing by tracking Sejuani's gank attempts, punishing her when she overextends or commits to fights.
Danger windows
Avoid early invades before your first full clear reset, as Sejuani's tankiness and CC make her dangerous in isolated fights.
Beware of river skirmishes around objectives when (R) is up and lanes lack priority, as she can start fights from fog.
Low-health clears near river entrances are risky; do not face-check or contest smite fights without vision and lane assistance.
Early game
Start with a full clear path aimed at safe camps away from river to avoid early invades from Sejuani.
Only contest first Scuttle if nearby lanes have priority and can assist to reduce risk of Sejuani's engage.
Track Sejuani's pathing and avoid low-health clears near river entrances to prevent being caught by her (Q) engage or (R) setup.
Power spikes
At level 6, use (R) to influence fights globally after enemies commit or drop low, punishing Sejuani's engage attempts.
Upon completing your first AP item, accelerate camp cycling and objective damage to pressure Sejuani before she builds tank items.
Respect Sejuani's level 6 (R) engage and first tank item spike that allows her to absorb more damage in fights; avoid direct fights without vision and lane support.
Win conditions
Convert your faster clear speed and AP item timing into early objective control by arriving first and using (Q) and (E) damage.
Use (R) after skirmishes or when enemies are low to secure kills and force Sejuani's team into defensive postures.
Deny Sejuani early tempo by avoiding her engages, counter-ganking effectively, and scaling into a global damage threat that influences fights across the map.
Tip: For Karthus vs Sejuani, read overview, trading pattern, and danger windows first for a fast Jungle lane check.
