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Game patch 26.20Data Dragon 16.20.1

Reference patch 16.20.1

Cassiopeia ARAM · Howling Abyss

A champion-specific Howling Abyss plan with ARAM starting, shopping and teamfight rules. Summoner's Rift roles are not used here.

One shared laneOne-lane Howling Abyss preparation
Champion overview
Review patch unknownRecommendation review pending

These patches track recommendation review, build validation and item lookup separately. Updating item data does not complete a build review.

Recommendation patch
— Data Dragon
Build validation patch
16.19.1 Data Dragon
Item lookup patch
16.20.1 Data Dragon

Howling Abyss rules

Prepare for one shared lane

ARAM removes the normal Rift role map. Build around the champion, the five-player team and the next fight instead.

01
Start together

Review rerolls and the shared bench, then leave with an opening that fits this champion and the team around it.

02
Shop while dead

You cannot Recall to buy. Plan components before leaving the shop and use each death timer deliberately.

03
Share health relics

A relic heals nearby allies after a short delay. Signal it and avoid taking the trigger when a lower-health teammate needs the area.

04
Fight with the wave

Minions create structure pressure and safer space. Clearing first can be more useful than forcing another low-health engage.

ARAM · Howling Abyss

Bootless ARAM spell reference

Compare the opening with Riot's ARAM Recommended shop before leaving base. After that, purchases happen only while dead; the six usable inventory slots do not increase.

Death-only shopping
S
ARAM opening · separate from item 1

Guardian's Orb

950 gold

An ARAM ability-power starter to compare with the current Recommended shop.

1
Bootless control

Rylai's Crystal Scepter

2,600 gold

Cassiopeia cannot buy Boots. Rylai's Crystal Scepter uses this slot for health, ability power and a slow on damaging spells.

2
Spell core

Luden's Echo

2,750 gold

Adds mana and repeated spell impact.

3
Long-range follow-up

Horizon Focus

2,700 gold

Rewards reliable long-range spell contact.

4
Late spell power

Rabadon's Deathcap

3,500 gold

Multiplies the completed ability-power core.

5
Against resistance

Void Staff

3,000 gold

Adds percentage magic penetration against meaningful resistance.

6
Final option

Shadowflame

3,200 gold

Completes the permanent inventory with stronger magic damage against low-health targets.

Buy this only after selling the Guardian starter when all six permanent slots are needed.

Complete build choices

Choose the route before play

Recommendation review pending

AlternativeToo much healingMorellonomicon applies anti-heal. Buy it earlier only when healing is already deciding fights.View full route

Best when: Morellonomicon applies anti-heal. Buy it earlier only when healing is already deciding fights.

  1. Bootless controlRylai's Crystal Scepter
  2. Spell coreLuden's Echo
  3. Morellonomicon
  4. Late spell powerRabadon's Deathcap
  5. Against resistanceVoid Staff
  6. Final optionShadowflame

Buy this only after selling the Guardian starter when all six permanent slots are needed.

AlternativeThey burst meZhonya's stasis can absorb a committed dive or lethal burst window.View full route

Best when: Zhonya's stasis can absorb a committed dive or lethal burst window.

  1. Bootless controlRylai's Crystal Scepter
  2. Spell coreLuden's Echo
  3. Zhonya's Hourglass
  4. Late spell powerRabadon's Deathcap
  5. Against resistanceVoid Staff
  6. Final optionShadowflame

Buy this only after selling the Guardian starter when all six permanent slots are needed.

AlternativeOne spell stops meBanshee's spell shield can protect the first important cast against you.View full route

Best when: Banshee's spell shield can protect the first important cast against you.

  1. Bootless controlRylai's Crystal Scepter
  2. Spell coreLuden's Echo
  3. Long-range follow-upHorizon Focus
  4. Banshee's Veil
  5. Against resistanceVoid Staff
  6. Final optionShadowflame

Buy this only after selling the Guardian starter when all six permanent slots are needed.

Complete build comparison

Complete build comparison

Recommendation review pending

Build review neededBootless ARAM spell referenceRecommendation review pendingView full route

Recommendation review pending

  1. Bootless controlRylai's Crystal Scepter
  2. Spell coreLuden's Echo
  3. Long-range follow-upHorizon Focus
  4. Late spell powerRabadon's Deathcap
  5. Against resistanceVoid Staff
  6. Final optionShadowflame

Buy this only after selling the Guardian starter when all six permanent slots are needed.

AlternativeToo much healingMorellonomicon applies anti-heal. Buy it earlier only when healing is already deciding fights.View full route

Best when: Morellonomicon applies anti-heal. Buy it earlier only when healing is already deciding fights.

  1. Bootless controlRylai's Crystal Scepter
  2. Spell coreLuden's Echo
  3. Morellonomicon
  4. Late spell powerRabadon's Deathcap
  5. Against resistanceVoid Staff
  6. Final optionShadowflame

Buy this only after selling the Guardian starter when all six permanent slots are needed.

AlternativeThey burst meZhonya's stasis can absorb a committed dive or lethal burst window.View full route

Best when: Zhonya's stasis can absorb a committed dive or lethal burst window.

  1. Bootless controlRylai's Crystal Scepter
  2. Spell coreLuden's Echo
  3. Zhonya's Hourglass
  4. Late spell powerRabadon's Deathcap
  5. Against resistanceVoid Staff
  6. Final optionShadowflame

Buy this only after selling the Guardian starter when all six permanent slots are needed.

AlternativeOne spell stops meBanshee's spell shield can protect the first important cast against you.View full route

Best when: Banshee's spell shield can protect the first important cast against you.

  1. Bootless controlRylai's Crystal Scepter
  2. Spell coreLuden's Echo
  3. Long-range follow-upHorizon Focus
  4. Banshee's Veil
  5. Against resistanceVoid Staff
  6. Final optionShadowflame

Buy this only after selling the Guardian starter when all six permanent slots are needed.

Runes and summoner spells

Runes and summoner spellsCassiopeiaHowling Abyss

This general ARAM spell page supports repeated ranged casts and the mode's higher mana pressure. Replace Clarity only when the champion does not need the resource.

ARAM
Primary tree

Sorcery

Arcane CometManaflow BandTranscendenceGathering Storm
Secondary tree

Precision

Presence of MindCut Down
Summoner spells
FlashClarity
Howling Abyss only

Mark and Clarity are mode-specific choices. Do not copy this pair onto a Summoner's Rift page.

Protect the next fight

Choose the second spell around access, survival and team resources rather than treating every ARAM champion as a diver.

Static alternatives

Compare the problem before changing the plan

These choices are not selected from live scores. Use one only after you identify the stated match problem yourself.

Only when enemy healing is deciding fights

Oblivion Orb

Oblivion Orb supplies healing reduction without committing to a completed Morellonomicon. Skip both when healing is not the problem or an ally already covers your target reliably. Healing reduction does not reduce shields.

Conditional component, not a core item. Complete Morellonomicon only when its stats and slot efficiency justify delaying another purchase.
They burst me

Zhonya's Hourglass

Zhonya's stasis can absorb a committed dive or lethal burst window.

One spell stops me

Banshee's Veil

Banshee's spell shield can protect the first important cast against you.

Situational AP purchase

When should you buy anti-heal?

Buy healing reduction when enemy healing or regeneration is deciding fights and you can keep damaging the relevant target. Grievous Wounds reduces healing; it does not reduce shields, magic damage or crowd control.

Start with the component

Oblivion Orb can provide healing reduction without immediately paying for a completed Morellonomicon. Fit the component around your core damage, mana and survival needs; check the current queue's item tooltip.

Finish when it fits the fight

Complete Morellonomicon when its stats and slot efficiency suit your build. Do not treat it as a mandatory first item just because your champion deals magic damage.

Coordinate coverage

Multiple Grievous Wounds sources do not add their percentages together. Another reliable applier may cover the same target, but you may still need your own source for a separate fight or target.

Repeated spell damage and damage over time can maintain coverage more reliably than a single hit. Match the purchase to your actual spell access, enemy sustain and the teammates who can apply the debuff.

Will the fight last long enough?

If you die before dealing damage, you apply no healing reduction. If your target dies before healing, there is little healing to prevent. The debuff applies on qualifying damage immediately; it does not need to build up. It remains briefly after your last hit, so teammates can benefit even after you disengage.

Only healing during the active debuff counts. For example, 40% reduction prevents 80 of a 200-point heal, or 400 of a 1,000-point heal, before other modifiers. Compare that with the damage, penetration or survival you delayed; neither example guarantees a kill. Healing after the debuff expires is unaffected.

See the Oblivion Orb and Morellonomicon references for current effects and queue availability. These are situational decisions, not a measured best-build claim.

Kit reference

Cassiopeia abilities

Ability names, descriptions and numeric fields come from Riot Data Dragon. Practical reads are independently written; the current in-game tooltip remains authoritative.

Abilities Data Dragon 16.20.1Cooldown / Cost / Range Data Dragon 16.20.1
P
Passive

Serpentine Grace

What it doesAll Move Speed bonuses are more effective on Cassiopeia.

Practical readSerpentine Grace is the always-on rule shaping Cassiopeia's normal trading and fight pattern. Watch its in-game state before committing.

Q
Q ability

Noxious Blast

What it doesCassiopeia blasts an area with Poison after a brief delay, granting her increased Move Speed if she hits an enemy champion.

Practical readNoxious Blast is part of Cassiopeia's Q pattern. Read its listed effect first, then track the cooldown and condition that make the next use valuable.

Cooldown3.5 secCost50/55/60/65/70Listed range850 units
W
W ability

Miasma

What it doesCassiopeia releases several clouds of poison, slowing, grounding, and lightly damaging enemies that pass through them. Grounded enemies cannot use Movement abilities.

Practical readMiasma contributes a slowing effect. Its value changes with cooldown, range and target access; recognise the setup before moving into its effective area.

Cooldown24/22/20/18/16 secCost70/75/80/85/90Listed range700 units
E
E ability

Twin Fang

What it doesCassiopeia 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.

Practical readTwin Fang contributes damage. Its value changes with cooldown, range and target access; recognise the setup before moving into its effective area.

Cooldown0.75 secCost45Listed range700 units
Protection

The protection or sustain is part of the cast's value. Compare its timing with incoming damage rather than reading only the offensive effect.

R
Ultimate

Petrifying Gaze

What it doesCassiopeia 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.

Practical readPetrifying Gaze contributes a slowing effect. Its value changes with cooldown, range and target access; recognise the setup before moving into its effective area.

Cooldown120/100/80 secCost100Listed range825 units

Adapt the plan

What to do when the game changes

Judge the whole lane or map state, not only personal kills. Choose the situation closest to the current game.

Even plan

Trade around health, range and the next wave

1
Wave

Let the team clear without spending every important cooldown at once.

2
Map play

Track the shared lane, brush control and available relics rather than looking for a Rift rotation.

3
Fights

Use the champion's reliable range, protection or control before forcing a low-percentage engage.

Shared-lane plan

Cassiopeia on Howling Abyss

Read health, range, wave position and respawn timing together. ARAM has no side-lane rotation, neutral-objective setup or normal ward-control loop.

ARAM only
1
Before the fight

Clear or escort the wave, check which allies are alive and preserve enough health to use the champion's reliable range, protection or engage.

2
During the fight

Use the nearest safe target and the team's reachable follow-up. Do not cross the whole enemy formation for a single low-health champion.

3
After the fight

Push with surviving minions, take the safe structure damage available and reset only through a real death rather than donating one alone.

Keep preparing

Stay inside the ARAM ruleset

Compare another champion, review all Howling Abyss builds, or return to the champion overview. Rift lanes and counter-pick claims stay out of this mode.

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