Rammus should leverage his strong gank threat and taunt lockdown to punish Diana's reliance on landing (Q) for burst trades.
Prioritize avoiding early direct duels since Diana clears faster and can outpace Rammus's tempo with her mobility and burst.
This is a scaling vs scaling jungle matchup where Rammus must use early ganks and cross-map pressure to offset Diana's faster clears and objective control.
Jungle Plan
Use early ganks on overextended AD-heavy lanes to capitalize on Rammus's taunt and (Q) engage before Diana reaches level 6.
Focus on controlling river vision and timing dragon setups when Diana is farming or resetting to limit her objective pressure.
Prioritize counter-jungling after successful ganks or when Diana is spotted on opposite side, avoiding direct fights unless you have lane priority or numbers advantage.
Danger windows
Avoid isolated river fights pre-level 6 where Diana can use (Q) and (E) mobility to burst and escape.
Be cautious contesting objectives when Diana has lane priority or her (R) is up, as she can force fights or picks.
Watch for Diana's reset on (E); if she uses it without resetting, she becomes vulnerable to counter-engage or counter-jungle attempts.
Early game
Start with a three or four-camp clear targeting lanes that are pushed or vulnerable to maximize early gank impact.
Avoid fighting Diana early unless you have lane priority or she misses (Q), as her clear speed and mobility make early invades risky.
Contest first Scuttle only if nearby lanes can move first and provide counter-gank support to mitigate Diana's mid-game objective control.
Power spikes
Rammus spikes with early gank pressure using (Q) and (E) to lock down targets before Diana hits level 6.
Respect Diana's level 3 burst combo ((Q)+(W)+(E)) as it enables her all-in potential and forces Rammus to play around cooldowns.
Track Diana's level 6 (R) availability closely, as her ultimate significantly increases her teamfight and pick threat.
Win conditions
Convert early gank pressure into objective control by securing dragons and Rift Herald when Diana is farming or out of position.
Use Rammus's taunt and (Q) engage to lock down key AD carries in teamfights, leveraging his scaling armor and crowd control.
Deny Diana free farm and force her off camps by tracking her pathing and punishing cooldown mistakes to delay her mid-game power spikes.
Tip: For Rammus vs Diana, read overview, trading pattern, and danger windows first for a fast Jungle lane check.
