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Game patch 26.21Data Dragon 16.21.1

Reference patch 16.20.1

Senna 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

ARAM marksman 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 Hammer

950 gold

An ARAM attack-damage and sustain starter to compare with the current Recommended shop.

1
Attack-speed Boots

Berserker's Greaves

1,100 gold

Adds attack speed and movement for repeated attacks.

2
Repeated-attack core

Kraken Slayer

3,000 gold

Builds a reliable repeated-attack damage core.

3
Critical damage

Infinity Edge

3,500 gold

Increases critical-strike damage after critical chance is established.

4
Against armour

Lord Dominik's Regards

3,300 gold

Adds percentage armour penetration against meaningful armour.

5
Late sustain

Bloodthirster

3,400 gold

Adds high attack damage and sustain for extended late fights.

6
Final option

Immortal Shieldbow

3,000 gold

Completes the permanent inventory with critical strike and a low-health shield after the damage core is established.

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 healingMortal Reminder combines armour penetration with anti-heal.View full route

Best when: Mortal Reminder combines armour penetration with anti-heal.

  1. Attack-speed BootsBerserker's Greaves
  2. Repeated-attack coreKraken Slayer
  3. Critical damageInfinity Edge
  4. Mortal Reminder
  5. Late sustainBloodthirster
  6. Final optionImmortal Shieldbow

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

AlternativeMagic damage reaches meWit's End adds magic resistance without giving up attack speed.View full route

Best when: Wit's End adds magic resistance without giving up attack speed.

  1. Attack-speed BootsBerserker's Greaves
  2. Repeated-attack coreKraken Slayer
  3. Critical damageInfinity Edge
  4. Wit's End
  5. Late sustainBloodthirster
  6. Final optionImmortal Shieldbow

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 neededARAM marksman referenceRecommendation review pendingView full route

Recommendation review pending

  1. Attack-speed BootsBerserker's Greaves
  2. Repeated-attack coreKraken Slayer
  3. Critical damageInfinity Edge
  4. Against armourLord Dominik's Regards
  5. Late sustainBloodthirster
  6. Final optionImmortal Shieldbow

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

AlternativeToo much healingMortal Reminder combines armour penetration with anti-heal.View full route

Best when: Mortal Reminder combines armour penetration with anti-heal.

  1. Attack-speed BootsBerserker's Greaves
  2. Repeated-attack coreKraken Slayer
  3. Critical damageInfinity Edge
  4. Mortal Reminder
  5. Late sustainBloodthirster
  6. Final optionImmortal Shieldbow

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

AlternativeMagic damage reaches meWit's End adds magic resistance without giving up attack speed.View full route

Best when: Wit's End adds magic resistance without giving up attack speed.

  1. Attack-speed BootsBerserker's Greaves
  2. Repeated-attack coreKraken Slayer
  3. Critical damageInfinity Edge
  4. Wit's End
  5. Late sustainBloodthirster
  6. Final optionImmortal Shieldbow

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

Runes and summoner spells

Runes and summoner spellsSennaHowling Abyss

The marksman page preserves sustained damage and spacing. Flash and Ghost provide two player-controlled movement tools on the narrow Howling Abyss.

ARAM
Primary tree

Precision

Lethal TempoPresence of MindLegend: AlacrityCut Down
Secondary tree

Sorcery

CelerityGathering Storm
Summoner spells
FlashGhost
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.

Too much healing

Mortal Reminder

Mortal Reminder combines armour penetration with anti-heal.

Magic damage reaches me

Wit's End

Wit's End adds magic resistance without giving up attack speed.

Kit reference

Senna 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 (s) / Cost / Listed range (units) Data Dragon 16.20.1
P
Passive

Absolution

What it doesWhen units die near Senna, their souls are periodically trapped by the Black Mist. Senna can attack these souls to free them, absorbing the Mist that held them in death. Mist fuels her Relic Cannon's power with increased Attack Damage, Attack Range, and Critical Strike Chance. Attacks from Senna's Relic Cannon take longer to fire, deal bonus damage, and briefly grant her a portion of her target's Move Speed.

Q
Q ability

Piercing Darkness

What it doesFrom the twin barrels of her Relic Cannon, Senna fires a unified beam of light and shadow through a target, healing allies and damaging enemies.

Cooldown (s)15Cost70/80/90/100/110Listed range (units)600
W
W ability

Last Embrace

What it doesSenna sends forth a wave of Black Mist. If it hits an enemy it latches onto them hungrily, rooting them and everything nearby after a brief delay.

Cooldown (s)11Cost50/55/60/65/70Listed range (units)1250
E
E ability

Curse of the Black Mist

What it doesSenna draws the Mist she has stored in her weapon into a storm around her, embracing darkness and becoming a wraith within. Allies who enter the area are camouflaged and also appear as wraiths as the Mist shrouds them. Wraiths gain increased Move Speed, are unselectable, and hide their identities.

Cooldown (s)26/24.5/23/21.5/20Cost70Listed range (units)400
R
Ultimate

Dawning Shadow

What it doesSenna calls upon the relic stones of fallen Sentinels, splitting her relic cannon into a holy array of shadow and light. She then fires a global beam that shields allies from harm, while damaging enemies caught in the center.

The exported range is not a verified gameplay distance. Check the current ability tooltip.

Cooldown (s)140/120/100Cost100

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

Senna 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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