Cassiopeia vs Syndra Matchup Guide

Cassiopeia

Cassiopeia

Mid Lane Control Mage

The Serpent's Embrace – sustained DPS battlemage without boots

VS
Syndra

Syndra

Mid Lane Control Mage

Ball manipulation mage with long-range stun and execute

VerdictCassiopeia favored EarlySkill Matchup MidCassiopeia Favored LateCassiopeia Favored Updated Sep 15, 2025 · Patch 25.18

Champ Select Cheat Sheet — Cassiopeia vs Syndra

Runes
Conqueror, Presence of Mind, Legend: Haste, Last Stand
Secondary: Manaflow Band, Transcendence
Summoners
Flash + Teleport
Start
Doran's Ring (400g) + 2 Health Potions (100g) or Corrupting Potion (500g) vs poke
Core Build
TearArchangel's StaffRylai's Crystal ScepterLiandry's Torment
Trade Pattern
Pre-6: Q max range > 2x E > out; Post-6: Q > 3x E > step back
Short trades until Archangel's; never E without poison.
Danger Levels
Respect Syndra at level 6
First Back
Tear of the Goddess (400g)
Ideal Back (900–1150g)

Matchup Dynamics

How This Matchup Works

Cassiopeia vs Syndra pivots at level 3 when W grounds dashes and at first item (Archangel's/Rylai's). Syndra threatens early windows; Cass wins sustained DPS after 2 items.

Early Game (1-5)

Skill Matchup - Short trades only; freeze near tower until Tear; respect jungle timers (3:15–4:00).

Mid Game (6-11)

Cassiopeia Favored - With Archangel's and Rylai's/ROA stacks, Cass holds mid prio; answer roams with Unleashed TP at 10:00.

Late Game (12+)

Cassiopeia Favored - Cass sustained DPS wins extended fights; set W zones in chokes and front-to-back.

Key Interactions

  • W – MiasmaW – MiasmaCassiopeia releases several clouds of poison, slowing, grounding, and lightly damaging enemies that pass through them. Grounded enemies cannot use Movement abilities. to break setups: Place W – MiasmaW – MiasmaCassiopeia releases several clouds of poison, slowing, grounding, and lightly damaging enemies that pass through them. Grounded enemies cannot use Movement abilities. on minions when Syndra looks for Q or E; grounding denies flashFlashTeleports you a short distance toward your cursor. follow and lets Q – Noxious BlastQ – Noxious BlastCassiopeia blasts an area with Poison after a brief delay, granting her increased Move Speed if she hits an enemy champion. tag for E – Twin FangE – Twin FangCassiopeia lets loose an attack that deals increased damage to Poisoned targets and heals her for a percentage of the damage dealt. If the target dies from this attack, Cassiopeia regains Mana. resets.
  • Trade after key spell: Trade 2x E – Twin FangE – Twin FangCassiopeia lets loose an attack that deals increased damage to Poisoned targets and heals her for a percentage of the damage dealt. If the target dies from this attack, Cassiopeia regains Mana. after Q – Dark SphereQ – Dark SphereSyndra conjures a Dark Sphere dealing magic damage. The sphere remains and can be manipulated by her other powers. on wave; most CDs 7–12s early give a 2–4s punish if Q – Noxious BlastQ – Noxious BlastCassiopeia blasts an area with Poison after a brief delay, granting her increased Move Speed if she hits an enemy champion. lands.
  • Ultimate counter-engage: Hold R – Petrifying GazeR – Petrifying GazeCassiopeia releases a swirl of magical energy from her eyes, stunning any enemies in front of her that are facing her and slowing any others with their back turned. for gank or cannon contest; face them during commit to secure stun then kite on W – MiasmaW – MiasmaCassiopeia releases several clouds of poison, slowing, grounding, and lightly damaging enemies that pass through them. Grounded enemies cannot use Movement abilities..
  • Zone with Q radius: Threaten Q – Noxious BlastQ – Noxious BlastCassiopeia blasts an area with Poison after a brief delay, granting her increased Move Speed if she hits an enemy champion. when they last-hit; on hit weave 3–5 E – Twin FangE – Twin FangCassiopeia lets loose an attack that deals increased damage to Poisoned targets and heals her for a percentage of the damage dealt. If the target dies from this attack, Cassiopeia regains Mana. under 2s with poison.

Cassiopeia

Strengths

  • Sustained DPS: E resets at 0.75s on poisoned targets allow 3–4 casts/s mid game
  • Anti-dash control: W grounds and slows, blocking most gap-closers
  • Zone control: Q + W forces awkward farm angles; punish cannon timings

Weaknesses

  • No dash; gankable pre-6 if wave pushed
  • Mana-gated until Tear/Archangel’s; missed Q reduces trade power
  • R needs facing for stun; mistime yields only slow

Syndra

Strengths

  • Reliable waveclear with Q – Dark SphereQ – Dark SphereSyndra conjures a Dark Sphere dealing magic damage. The sphere remains and can be manipulated by her other powers. to control tempo
  • Long-range poke can chip before Archangel’s
  • Strong objective setup around chokes

Weaknesses

  • Immobile when FlashFlashTeleports you a short distance toward your cursor. down; vulnerable to GhostGhostGain Move Speed and ignore unit collision for the duration. + R turn
  • Struggles to escape W zone when contesting mid wave
  • Lower single-target DPS in extended fights

Power Curve Comparison EXPERIMENTAL

Power Curve Visualization

Win Conditions

Cassiopeia's Win Condition

  • Freeze 6–8 minions from tower pre-6; call jungler at 3:15 for grounded W gank
  • Crash Wave 4 for Tear buy; TP back if needed to keep prio
  • Front-to-back at objectives with W zones; face before R to stun carry

Syndra's Win Condition

  • Trade on Cass Q miss; force pre-6 all-ins with jungler
  • Roam on shoved waves before Cass gets Archangel's
  • Avoid extended fights inside MiasmaW – MiasmaCassiopeia releases several clouds of poison, slowing, grounding, and lightly damaging enemies that pass through them. Grounded enemies cannot use Movement abilities.; play to sides and flanks

Laning Phase Guide

Level/Phase Cassiopeia Syndra
Level 1 Start Q – Noxious BlastQ – Noxious BlastCassiopeia blasts an area with Poison after a brief delay, granting her increased Move Speed if she hits an enemy champion.; last-hit; tag on cs; keep wave even; ward raptor brush at 2:20 if pushing; no all-in pre-2. Start Q; poke on last-hits; avoid walking into Q radius; ward pixel at 2:20 if pushing.
Level 2 Take E – Twin FangE – Twin FangCassiopeia lets loose an attack that deals increased damage to Poisoned targets and heals her for a percentage of the damage dealt. If the target dies from this attack, Cassiopeia regains Mana.; punish only after Q hits; 2x E then out; crash at ~2:40 if HP lead to buy Tear. Take W; trade when Cass Q misses (3.5–4.5s); thin wave to avoid freeze.
Level 3 Take W – MiasmaW – MiasmaCassiopeia releases several clouds of poison, slowing, grounding, and lightly damaging enemies that pass through them. Grounded enemies cannot use Movement abilities.; place on minions to deny dash paths; call jungler at 3:15 for grounded setup; all-in only if Q hits. Respect E – Scatter the WeakE – Scatter the WeakSyndra knocks enemies and Dark Spheres back dealing magic damage. Enemies hit by Dark Spheres become stunned. or Q – Dark SphereQ – Dark SphereSyndra conjures a Dark Sphere dealing magic damage. The sphere remains and can be manipulated by her other powers.; do not dash inside MiasmaW – MiasmaCassiopeia releases several clouds of poison, slowing, grounding, and lightly damaging enemies that pass through them. Grounded enemies cannot use Movement abilities.; keep lane centered before 3:30 gank.
Level 4-5 Hold freeze 3–4 waves; punish cannon with Q>E; ward opposite river at 4:00; recall on Wave 4 (first cannon) for Tear + Dark SealDark SealProvides Ability Power and Mana. Increases in power as you kill enemies.. Shove with waveclear; hover to one side with ward; prevent freeze by last-hitting casters late.
Level 6 Track jungle; turn ganks with R by facing; pre-place W; if R stuns, E-chain to kill; don’t R if they’re not facing. Look for R window when Cass Q is down; bait R by turning away; break vision to reduce stun odds.
Level 7-8 Stack Tear; seek trades after Q; force objectives with shove; TP at 10:00 Unleashed TP timing. Roam only after pushing; avoid fighting in river choke vs W zone; track Cass GhostGhostGain Move Speed and ignore unit collision for the duration./TP.
Level 9 E max online; take 2–3 wave trades; set up vision at 9:30 for herald; swap to sweeper if ahead. Respect perma-slow if Cass has Rylai’s; buy Null-Magic/Seeker’s as needed; farm under tower.

Power Spikes

Level Spikes

Cassiopeia Syndra
Level Description Level Description
2 Minor Q + E loop online; trade only after Q hits. 5 Minor Waveclear breakpoint; can shove and move.
3 Major W grounds dashes; set up ganks and deny engage. 6 Major Ultimate enables pick or zone control.
6 Critical R turn potential; face to stun on all-in. 9 Minor First max rank improves poke/control.
9 Major Maxed E reaches 0.75s CD on poison; DPS spike.

Item Spikes

Cassiopeia Syndra
Item Description Item Description
Tear of the GoddessTear of the GoddessIncreases maximum Mana as Mana is spent (400g) Fix mana; start stacking early. First legendary (Luden's/Stormsurge/Seraph/QSS/etc.) (2600–3000g) Damage or safety spike depending on choice.
Archangel's StaffArchangel's StaffIncreases Ability Power based on maximum Mana (2900g) Mana → AP + shield; unlock spam trades. Serrated DirkSerrated DirkIncreases Attack Damage and Lethality spike (1100g) Assassins gain one-shot thresholds pre-6.
Rylai's Crystal ScepterRylai's Crystal ScepterAbilities slow enemies (2600g) Perma-slow keeps targets inside Q/W for E chains. Zhonya's/Maw/Banshee's (2800–3100g) Defensive buy shifts skirmishes.
Liandry's TormentLiandry's TormentCharge up in combat to deal high damage over time, especially against durable enemies (3000g) Burn shreds tanks; synergizes with Rylai’s.
Zhonya's HourglassZhonya's HourglassActivate to become invincible but unable to take actions (3000g) Stasis vs assassin ults; bait then re-engage with R.

Best Build for Cassiopeia

Starting Items

Doran's RingDoran's RingGood starting item for casters (400g) + 2 Health Potions (100g) or Corrupting PotionCorrupting PotionRestores Health and Mana over time and boosts combat power - Refills at Shop (500g) vs poke

Core Items

Tear → Archangel's StaffArchangel's StaffIncreases Ability Power based on maximum Mana → Rylai's Crystal ScepterRylai's Crystal ScepterAbilities slow enemies → Liandry's TormentLiandry's TormentCharge up in combat to deal high damage over time, especially against durable enemies

Runes

Primary: ConquerorConquerorGain stacks of adaptive force when attacking enemy champions. After reaching 12 stacks, heal for a portion of damage you deal to champions., Presence of MindPresence of MindRestore a small amount of mana or energy when damaging an enemy champion. Takedowns restore mana or energy., Legend: HasteLegend: HasteTakedowns on enemies grant permanent Basic Ability Haste., Last StandLast StandDeal more damage to champions while you are low on health.

Secondary: Manaflow BandManaflow BandHitting an enemy champion with an ability permanently increases your maximum mana by 25, up to 250 mana.After reaching 250 bonus mana, restore 1% of your missing mana every 5 seconds., TranscendenceTranscendenceGain bonuses upon reaching the following levels:Level 5: +5 Ability Haste Level 8: +5 Ability Haste Level 11: On Champion takedown, reduce the remaining cooldown of basic abilities by 20%.

Summoner Spells

FlashFlashTeleports you a short distance toward your cursor. + TeleportTeleportAfter a brief channel, become untargetable and travel to an allied unit. Upgrades into Unleashed Teleport, which significantly increases travel speed.

Priority Build Path

1
Archangel's Staff

Mana to AP + shield lets you frontload E spam.

2
Rylai's Crystal Scepter

Perma-slow to stick/kite on W.

3
Liandry's Torment

Burn amplifies DPS in extended fights.

4
Zhonya's Hourglass

Stasis vs dive; core vs assassins.

Situational Adjustments

  • Banshee's VeilBanshee's VeilPeriodically blocks enemy abilities: Versus pick/long-range engage (e.g., Ahri E, Syndra E)
  • MorellonomiconMorellonomiconIncreases magic damage: Versus heavy healing (Sylas/Aurelion Sol)
  • Rabadon's DeathcapRabadon's DeathcapMassively increases Ability Power: When ahead needing raw DPS 3rd/4th

Key Patterns

Lethal Combos

Cassiopeia Full Combo (Level 6+):

Q – Noxious Blast hit > W – Miasma under target > spam E – Twin Fang 4–6 times > R – Petrifying Gaze when they face > E – Twin Fang to finish

Lethal at ~30–40% HP with Liandry’s + Rylai’s.
Syndra Escape/Counter Combo:

Sidestep Q; wait out W – Miasma; commit with R – Unleashed Power then exit before Cass R – Petrifying Gaze

Burst before Archangel’s shield procs.

Trading Combos

Cassiopeia Short Trade:

Pre-6: Q max range > 2x E > out; Post-6: Q > 3x E > step back

Short trades until Archangel's; never E without poison.
Syndra Quick Trade:

Trade after Cass Q misses; 1–2 autos/abilities then disengage

Punish mana use; avoid fighting inside W.

Lethal Thresholds

  • Cassiopeia Kill Range: R stun + 4–6 Es with Liandry’s burns 1200–1600 HP; ~30% HP kill if poisoned.
  • Syndra Kill Range: Assassins: 100–0 at 6 with IgniteIgniteDeals true damage over time to target enemy champion and reduces healing effects on them for the duration. when Cass <900 HP; mages: burst <40% HP if R lands.
  • Critical Levels: Cass 3/6/9; Opp 3/6/11

Level by Level Game Plan

Level Primary Goal Lane Position Trading Opportunities Kill Windows Setup Opportunities
1 Farm safely; tag with Q if free Midline or slight pull Only after Q hits Low Stack for level 2 first
2 Unlock E trades Keep wave 6–8 from tower Q>2xE then out Low HP >60%
3 Control with W Freeze near tower Ground then Q>E Medium vs dash champs Ping jungler 3:15–3:45
4-5 Cannon recall Crash Wave 4 then base Short Q>E pokes Low Buy Tear + Dark SealDark SealProvides Ability Power and Mana. Increases in power as you kill enemies.
6 R turn Hover safe side Hold R as counter High if R stuns Place W before commit
7-8 Tempo with TP Push then move Extended with items Medium Deep wardDeep WardYour wards in the enemy jungle are Deep, gaining Health and Duration.Level 9: Wards in the river are also Deep. path
9+ Transition to mid Control prio E spam on poison High with Rylai’s Vision for objectives
Mid Game (11-16) Skirmish wins River/jungle control Front-to-back on W Pick into W zone Start objectives after shove
Late Game (16+) Teamfight execution Backline anchor Kite on W zones Chain E on stun Keep FlashFlashTeleports you a short distance toward your cursor. for self-peel

First Back Goals

Ideal Back (900–1150g)

  • Tear of the GoddessTear of the GoddessIncreases maximum Mana as Mana is spent (400g)
  • Dark SealDark SealProvides Ability Power and Mana. Increases in power as you kill enemies. (350g)
  • Amplifying Tome (400g)

Crash Wave 4 (first cannon) ~2:30–3:00; recall; TP back if needed.

Standard Back (700–900g)

  • Tear of the GoddessTear of the GoddessIncreases maximum Mana as Mana is spent (400g)
  • Refillable Potion (150g)
  • Control Ward (75g)

Recall after pushing on cannon; avoid non-cannon recall.

Teamfight Tips

Aspect Cassiopeia Syndra
Primary Role Backline DPS/control mage Assassin/burst/control depending on champ
Target Priority Closest diver
Enemy carry inside W
Frontline <40% HP		 Eliminate Cass first or isolate backline
Objective Control Set W in chokes for drake/baron
Hold R for turn on facecheck		 Engage before Cass sets zones
Flank to force her R slow
Positioning Front-to-back in chokes (river/jungle entrances)
Avoid wide spaces where enemies spread		 Flank or long poke to force early R
Other Tips Face the biggest threat before R to guarantee stun
Layer W on carries to block FlashFlashTeleports you a short distance toward your cursor.; chase with GhostGhostGain Move Speed and ignore unit collision for the duration.		 Bait R by turning away; fight out of W zones