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Cassiopeia Guide

Ability numbers checked on patch 26.21 · Strategy reviewed: October 2026

Cassiopeia splash art for this Cassiopeia guide

Cassiopeia plays the mid lane as the Serpent’s Embrace poison-mage sustained-DPS pick on patch 26.22. Noxious Blast lands a delayed-explosion at a target point that poisons enemies hit. Miasma leaves a trail of poison fog along her path that slows and poisons enemies walking through. Twin Fang fires an auto-attacking fang at a target enemy; against poisoned enemies, Twin Fang deals bonus damage and refunds mana. Petrifying Gaze emits a cone from Cassiopeia that stuns enemies facing her and slows those facing away.

Cassiopeia’s Data Dragon file lists her under Mage tag, 10 out of 10 difficulty rating, 550 ranged auto range, and Mana as the pool. Her Serpentine Grace passive grants Cassiopeia bonus Movement Speed per level (no boots required); the trade-off is she cannot buy regular Boots.

Abilities and role

Cassiopeia’s lane plan on patch 26.22 is the Mid lane solo-queue poison-mage sustained-DPS. The Twin Fang spam cycle against poisoned enemies cycles her mana efficiently; her Petrifying Gaze face-stun during committed teamfights locks the enemy backline in place.

Serpentine Grace (Passive)

Cassiopeia gains bonus Movement Speed per level (she cannot buy regular Boots). For what it’s worth, Serpentine Grace is Cassiopeia’s primary mobility engine; a committed scaling pattern turns her Movement Speed into Zoom’s-tier late-game.

Noxious Blast (Q)

Cassiopeia lands a delayed-explosion at a target point. Enemies hit are poisoned. On hit, Cassiopeia gains bonus Movement Speed. 3.5 second cooldown, 50 to 90 mana. The Q is Cassiopeia’s primary wave-clear tool AND poison-stacking tool; a committed Noxious Blast on the enemy mid-laner during all-in trade windows poisons them for the follow-up Twin Fang cycle.

Miasma (W)

Cassiopeia leaves a trail of poison fog along her path. Enemies walking through the fog are slowed and poisoned. 24 to 16 second cooldown, 70 to 110 mana. The W is Cassiopeia’s primary setup tool; a committed Miasma around a jungle entrance covers scout plus poison zones.

Twin Fang (E)

Cassiopeia fires an auto-attacking fang at a target enemy. Against poisoned enemies, Twin Fang deals bonus damage and refunds mana. 0.75 second cooldown, 40 to 60 mana (refunded against poisoned enemies). The E is Cassiopeia’s primary damage ability; a committed Twin Fang spam cycle against a poisoned enemy mid-laner lands massive sustained DPS.

Petrifying Gaze (R)

Cassiopeia emits a cone from herself. Enemies facing her are stunned for 2 seconds; enemies facing away are slowed for 2 seconds. 120 to 80 second cooldown, 100 mana. The R is Cassiopeia’s primary teamfight AoE lockdown; a committed Petrifying Gaze against grouped enemies at the bridge choke stuns 3+ enemies for an all-in burst payoff.

Build and item spikes

Cassiopeia’s lane start pairs Doran’s Ring with 2 Potions (no boots because of Serpentine Grace). The first-item rush is Malignance for the Hatefog zone proc on R Petrifying Gaze — the Hatefog burn triggers during the committed R channel, compounding her sustained-DPS cycle.

Slot two picks Nashor’s Tooth for the Attack Speed on committed Twin Fang spam cycles (Twin Fang scales with Attack Speed through on-hit proc). Slot three brings Riftmaker for the Omnivamp inside all-in Twin Fang spam chains, Horizon Focus for the mid-range damage amp on all-in Noxious Blast poke, or Spellbinder for the all-in burst payoff. The LoL items database maps every slot through the sixth item.

How to play by game stage

Pre-6 Cassiopeia plays Noxious Blast pokes on the enemy mid-laner during cannon-wave resets. Weave Twin Fang spam cycles against poisoned enemies for committed trades. First solo kill opens at level 6 with Noxious Blast poison + Miasma slow + Twin Fang spam + Petrifying Gaze face-stun.

Mid game (7-13): Seraph’s Embrace online is Cassiopeia’s mid-game spike. Rotate to Drake with the ally jungler in tow. Save R Petrifying Gaze for the committed teamfight at the dragon pit.

Late game (14+): Cassiopeia fights behind the ally frontline. Twin Fang spam against grouped poisoned enemies at the Baron pit lands massive sustained DPS. A Zhonya’s Hourglass third item lets Cassiopeia survive dive attempts after the committed Petrifying Gaze lands.

Who counters Cassiopeia

Cassiopeia’s weakness list on 26.22 picks out specific archetypes. Spell-shield assassins (LeBlanc Distortion, Fizz E, Katarina R dash) sidestep her Twin Fang’s single-target lock. Early-game burst roamers (Pantheon, Talon, Rek’Sai) punish Cassiopeia’s slow level-1 phase before her Twin Fang spam ramps. Grievous-Wounds enablers (Morellonomicon on an enemy mage) shut down her sustain inside long trades.

  • Spell-shield assassins: LeBlanc, Fizz, Katarina. Each sidestep her Twin Fang’s single-target lock on their dash resets.
  • Early-burst roamers: Pantheon, Talon, Rek’Sai. Each punishes Cassiopeia’s weaker level-1 phase before her Twin Fang spam ramps up.
  • Grievous Wounds: Morellonomicon on enemy mages. Each cancels Cassiopeia’s E Twin Fang sustain inside long trades with Grievous Wounds application.

Deeper matchup notes with ability-level timings for every Cassiopeia opponent land on the Cassiopeia counters page.

ARAM notes

Howling Abyss suits Cassiopeia’s sustained-DPS kit (every bridge fight channels into Twin Fang spam against grouped targets). Malignance opens for the Hatefog R-channel proc that chains burn during Petrifying Gaze face-stuns. Nashor’s Tooth arrives second for the Attack Speed scaling that compounds Twin Fang’s on-hit refund cycle. Riftmaker lands third for Omnivamp inside her sustained Twin Fang spam.

Cassiopeia ARAM pairs well with front-line ally picks (Malphite, Sejuani, Rell) whose engage pins enemies long enough for the committed Twin Fang spam DPS. The Cassiopeia ARAM build page carries the full item path and matchup table.

Cassiopeia skins

Skins: 9 · Newest: Desperada Cassiopeia (2026)

Theme-wise, the lineup includes Coven, Bewitching, Siren, Jade Fang and multiple event drops. Three stand out for full VFX reworks on R Petrifying Gaze animation.

  • Coven Cassiopeia (1350 RP): witch-coven theme with reworked ritual-crystal Noxious Blast and summon-circle R.
  • Bewitching Cassiopeia (1350 RP): Halloween-event theme with reworked pumpkin-trail Miasma and candy-corn R.
  • Siren Cassiopeia (975 RP): ocean-event theme with reworked wave-trail Twin Fang and tidal R.

See All Cassiopeia skins and prices for the full catalogue with RP tags and release years.

FAQ

Is Cassiopeia easy to learn?

10/10 is the Yoast rating; practical difficulty is 7/10. Twin Fang (E) requires standing still to spam, but a stand-still mage in 2026 dies to any jungler with a dash. Cassiopeia mains learn to orb-walk E between the autos of enemies without boots. R Petrifying Gaze is a semicircle facing the enemy — do not R backwards. The mana cost ramp is brutal; recall after one wave if blue buff is dead.