Use Rengar's superior early dueling and mobility to invade and control river brush before Sejuani can establish vision or contest Scuttle.
Focus on brush control and pick setups with (R) to deny Sejuani camps and force her into reactive pathing before she groups for teamfights.
Jungle Plan
Invade Sejuani's jungle early when lanes can collapse on her, focusing on camps near river brush to leverage your dueling and stealth advantage.
Control river brush and contest Scuttle when your lanes have priority to deny Sejuani vision and objective control before dragon or Rift Herald.
Use (R) to pick off isolated targets before starting dragon or Baron setups, forcing Sejuani into grouped fights where she is less effective.
Danger windows
Respect Sejuani's early ganks when she has melee lane allies ready to stack (E) for reliable CC chains.
Avoid isolated river fights or forced smite contests where Sejuani's tankiness and CC can turn the fight against you.
Beware of Sejuani entering river first with (R) available before objectives; maintain vision and lane priority to reduce surprise engages.
Early game
Start with a three-camp clear through brush-heavy routes to hit level 3 quickly and maximize invade potential.
Contest first Scuttle only if your nearby lanes have priority to cover your exit and prevent Sejuani's engage.
Avoid isolated river fights early where Sejuani's tankiness and CC can punish you; path around lanes with priority for safer invades.
Power spikes
At level 6, Rengar's (R) stealth pick threat spikes; use it to force Sejuani to respect fog and avoid overextensions.
Sejuani's level 6 (R) long-range engage requires respecting fog angles and avoiding grouped fights in narrow objective entrances.
Sejuani's first tank item spike increases her frontline durability; prioritize fights where you can isolate her or her carries instead of engaging her tank first.
Win conditions
Convert brush control and early invades into denying Sejuani camps and forcing her into reactive pathing.
Use (R) to pick off isolated targets and create numbers advantages for dragon or Rift Herald fights.
Maintain river vision and lane priority to control objective entrances, forcing Sejuani into unfavorable grouped fights where your damage and mobility excel.
Tip: For Rengar vs Sejuani, read overview, trading pattern, and danger windows first for a fast Jungle lane check.
