Rammus should leverage his high gank threat and mobility to pressure overextended lanes early and deny Sejuani free farm.
Prioritize avoiding prolonged isolated duels where Sejuani's tankiness and CC chain excel; focus on cross-map plays and objective timing to control the game.
Jungle Plan
Use fast gank angles with (Q) and taunt (E) to punish pushed or immobile lanes before Sejuani can arrive.
Prioritize river control and contest dragon only when you have lane priority or numbers advantage to counter Sejuani's strong objective presence.
Track Sejuani's pathing to counter-gank her early pressure and use cross-map plays to deny her camps and scaling.
Danger windows
Beware when (R) is up before objectives; avoid entering narrow river choke points alone to prevent long-range engage and CC chains.
Avoid isolated river fights early where Sejuani can stack CC with melee allies, increasing her kill threat.
Be cautious contesting smite fights if your health or cooldowns are low, as Sejuani's tankiness and CC can turn fights quickly.
Early game
Start with a three or four-camp clear toward lanes that show overextension to maximize early gank impact.
Contest first Scuttle only if nearby lanes have priority to avoid risky fights against Sejuani's strong invade resistance.
Avoid direct early invades unless Sejuani is spotted on opposite side; ward defensively against her controlled pathing and gank setups.
Power spikes
At level 6, use Rammus's (R) knockup combined with (Q) speed to outplay Sejuani's engage and create pick opportunities.
Exploit Sejuani's weaker early dueling before she completes her first tank item by forcing fights around camps or lanes with follow-up damage.
Respect Sejuani's power spike on first tank item as she can absorb cooldowns and set up CC chains, so avoid fighting her frontline without backup.
Win conditions
Convert early gank pressure into objective control by securing dragons and Rift Herald with lane priority and vision dominance.
Use Rammus's taunt and mobility to lock down key AD carries in teamfights, leveraging anti-AD scaling to carry late game.
Deny Sejuani free farm and scaling by counter-jungling camps when she shows on the map or commits to grouped fights, forcing her into unfavorable skirmishes.
Tip: For Rammus vs Sejuani, read overview, trading pattern, and danger windows first for a fast Jungle lane check.
