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Poseidon Build Guide

Poseidon portrait

Poseidon

Tank class icon
Otis
SSR Ice Tank Tank

Poseidon is an SS tank who becomes a wall: her ULT grants +123.7% max HP and raises a moving [Sea Wall] that gives allies behind it block rate and damage reduction, her passive stacks [Tide Law] (+27% DEF each, up to 12) and opens in [High Tide] immediately, and her auto permanently stacks +15.2% max HP while dragging ranged enemies closer. Positioning matters: your team stands behind the wall.

Skill Priority

Skill level recommendations:

1
Ultimate: Sea Wall Sanctuary
Level 14
Energy Cost: 5 Cooldown: 8.0s After casting Poseidon enters [High Tide] for 8 seconds. [High Tide] Max HP increases by 123.7%. A moving [Sea Wall] rises in front of Poseidon. Allied units behind [Sea Wall] within a 5-meter fan-shaped area including Poseidon gain: Block Rate increases by 70.7%. Block Damage Reduction increases by 44.7%. Damage taken is reduced by 40.2%. When an allied unit inside [Sea Wall] is hit and does not already have [Backflow] while Poseidon has [Tide Law] consume 1 stacks of [Tide Law] to grant the target [Backflow] for 10 seconds. [Backflow]: Gain an additional 26% Block Rate. Gain an additional 6.4% Block Damage Reduction. Damage taken is additionally reduced by 26%. [Block]: Has a chance to reduce that instance of damage by 30%. Damage over time ignores Block.
2
Passive: Tidal Backflow
Level 14
[High Tide] and [Low Tide] cannot coexist. Enter [High Tide] immediately at the start of battle for 8 seconds. [Tide Law]: Up to 12 stacks. Each stack of [Tide Law] increases Poseidon's DEF by 27%. [Tidal Backflow]: Every time Poseidon consumes a total of 4 stacks of [Tide Law], she immediately restores HP equal to 81.4% of max HP.
3
Auto Skill: Siren Song Undertow
Level 14
Cooldown: 8.0s Max HP increases permanently by 15.2% up to 8 times. Gain 2 stacks of [Tide Law]. Deal ice damage equal to 22% of max HP to the enemy unit with the highest ATK more than 4.0 meters away and pull it 3 meters closer. After casting the skill if Poseidon is not in [High Tide] she enters [Low Tide] for 8 seconds. [Low Tide] Create a 3-meter radius [Vortex] centered on Poseidon that moves with her. Enemies inside [Vortex] have CRIT Rate reduced by 78% and DEF reduced by 23.6%. When allies attack an enemy inside [Vortex] Poseidon deals ice damage equal to 11.8% of max HP to all enemies inside [Vortex]. (Triggers at most once every 0.1 seconds) This damage is treated as [Follow-Up] damage. Gain 1 stacks of [Tide Law] after every 4 [Follow-Up] triggers.
4
Normal Attack: Tidal Shot
Level 14
Cooldown: 2.0s Deal ice damage equal to 12% of max HP to the designated enemy unit.

Recommended Memory Cards

These are the best memory cards for Poseidon:

Sea Deity's Soft Ritual memory card
Sea Deity's Soft Ritual ★ Exclusive
Must Have
Max HP increases by 40%. When the wearer casts an ultimate skill all allies gain [Tideguard] for 8 seconds. If [Tideguard] is gained again remove the existing [Tideguard] and its accumulated Critical Resistance bonus first. [Tideguard]: DEF increases by 28%. Block Rate increases by 5%. Each time an allied unit with [Tideguard] is hit its Critical Resistance increases by 15% up to 5 stacks until [Tideguard] ends. [Block]: Has a chance to reduce that instance of damage by 30%. Damage over time ignores Block.
Note: Exclusive card: +40% max HP and her ULT grants the whole team [Tideguard]. More HP is more Sea Wall for everyone.
Stats: HP 6,600 / ATK 480 / DEF 690
Under the Holy Armor memory card
Under the Holy Armor
Highly Recommended
Our HP increases by 25%, and self defense increases by 70%. After each skill use, all allies gain [Radiant Protection], reducing damage taken by 6% and increasing critical hit resistance by 5%, stacking up to 5 times, lasting 10 seconds.
Stats: HP 6,600 / ATK 480 / DEF 690

Alternative Memory Cards

Good alternative options if you don't have the recommended cards:

Eating secretly in a cafe memory card
Eating secretly in a cafe
Increases defense by 64%. After successfully neutralizing the attack, damage taken is reduced by 10% for 5 seconds. When the wearer holds a shield, damage taken is reduced by 18%.
Stats: HP 6,600 / ATK 480 / DEF 690
Her Trainer memory card
Her Trainer
Defense increases by 60%, after using an ULT, the wearer's damage taken decreases by 10% for 5 seconds, Shield applied by ULT increases by 20%
Stats: HP 6,600 / ATK 480 / DEF 690
Simple Birdcage memory card
Simple Birdcage
Defense increases by 64%, after a successful Block, damage taken decreases by 10% for 5 seconds, grants a Shield equal to 30% of max HP upon entering battle
Stats: HP 6,600 / ATK 480 / DEF 690

Runes Priorities

Focus on these rune stats for Poseidon:

Primary Stat:
Defense%
Secondary Stat:
HP%

Highly Recommended Stats:

DEF% HP%

Additional Stats:

DEF HP Healing Effectiveness%
Build Note: Everything scales off max HP: Zane 4-piece (HP +8%, post-ULT damage reduction) keeps the wall standing through the whole [High Tide].

Recommended Rune Sets:

Zahn rune (4-piece)
4-piece
+
Shattered-Foundation rune (2-piece)
2-piece
Zane 4-piece + Poki 2-piece
2-piece (Zane): HP increases by 8%
4-piece (Zane): After casting an ULT, self damage taken decreases by 5% for 10 seconds
2-piece (Poki): Defense increases by 12%

Alternative Builds:

Shattered-Foundation rune (4-piece)
4-piece
+
Zahn rune (2-piece)
2-piece
Poki 4-piece + Zane 2-piece
2-piece (Poki): Defense increases by 12%
4-piece (Poki): Shield effect increases by 20%
2-piece (Zane): HP increases by 8%

Main Stats by Position

Recommended main stats for each rune position for Poseidon:

Position 1: Fixed Main Stat

HP (Flat Value)

Always HP - no other options

Position 2: Fixed Main Stat

Attack (Flat Value)

Always Attack - no other options

Position 3: Fixed Main Stat

Defense (Flat Value)

Always Defense - no other options

Position 4: Variable Main Stats

Available Options:
Healing Effectiveness (%) Critical Rate (%) Critical Damage (%) Attack Penetration (%) Attack (%) HP (%) Defense (%)

Pick the recommended stat pair that matches the rune build below.

Position 5: Variable Main Stats

Available Options:
Wind Attribute Damage (%) Fire Attribute Damage (%) Ice Attribute Damage (%) Holy Attribute Damage (%) Chaos Attribute Damage (%) Attack (%) HP (%) Defense (%)

Position 6: Variable Main Stats

Available Options:
Attack (%) HP (%) Defense (%)

Awakening Priority

A2 is the biggest early jump, then A4. A3/A5 raise skill level caps (+2 each) and are dupe-gated: take A6 last for the team-wide bonus.

A1 Good

At the start of battle Poseidon immediately gains 4 stacks of [Tide Law]. The number of [Follow-Up] triggers needed to gain [Tide Law] is reduced from 4 to 3.

A2 Very Good

When [Tidal Backflow] is triggered, Poseidon's healing received increases by 50% for 15 seconds.

A3 Mid

[Normal Attack] [Skill] [Ultimate Skill] and [Passive] levels increase by 2.

A4 Good

Max HP increases by 65%. [Tide Law] additionally increases all resistances by 3.6%.

A5 Mid

[Normal Attack] [Skill] [Ultimate Skill] and [Passive] levels increase by 2.

A6 Good

Casting an ultimate skill to enter [High Tide] while in [Low Tide] retains the [Low Tide] effect for 4 more seconds. Using skills during [High Tide] can still grant [Low Tide] but it lasts only 4 seconds.

Team Synergy

Good Teammates:

NephthysKellerBorsFreyaGluttony - BeelzebubLust - Asmodeus

Soaks the damage so the carries can attack freely: pair her with the strongest damage dealers you own.