What is the best Defect deck archetype?

The Frost + Focus archetype with Defragment, Blizzard, and Glacier is widely considered the most reliable for high ascension. This build generates massive block through Frost orbs while Blizzard deals escalating damage. Alternatively, the Lightning + Electrodynamics build excels at area-of-effect damage and fast fights.

How does Focus work on the Defect?

Focus multiplies orb effectiveness. Each point of Focus adds 1 damage to Lightning orbs and 1 block to Frost orbs. At 0 Focus, a Lightning orb deals 3 damage; at 3 Focus, it deals 6 damage. Cards like Defragment (+1 Focus) and Biased Cognition (+4 Focus, then -1 per turn) are essential for scaling orb damage into the late game.

Should I take Claw on the Defect?

Claw is a controversial card. In dedicated Claw decks with multiple copies and Scrape/All For One for recursion, it can be extremely powerful — reaching 15+ damage per play. However, Claw requires deck commitment and doesn't scale well with Focus archetypes. It's a fun build-around, not a top-tier competitive choice.

What are the Defect's best rare cards?

Echo Form, Electrodynamics, and Biased Cognition are the Defect's top rare cards. Echo Form provides unmatched value in longer fights. Electrodynamics enables Lightning orb builds against multiple enemies. Biased Cognition offers enormous Focus scaling with a manageable downside that can be mitigated with Orange Pellets or Core Surge.

Card Category

Defect Cards

Complete guide to Defect cards in Slay the Spire 2 — all attacks, skills, powers, costs, rarities and synergies.

The Defect is a highly technical character who manipulates Orbs, Lightning, Frost, and Focus to control the battlefield. In Slay the Spire 2, the Defect's card pool offers the most complex and rewarding synergies in the game, demanding careful orb management and power-based scaling.

Orbs are the Defect's signature mechanic. Each orb slot passively generates an effect: Lightning orbs deal damage each turn, Frost orbs generate block, and Plasma orbs generate energy. Dark orbs build up damage that can be unleashed in a single burst. Cards like Zap, Coolheaded, and Doom and Gloom allow the Defect to fill orb slots quickly, while Dualcast and Electrodynamics evoke orbs for immediate effects or chain lightning.

Focus determines orb effectiveness. Higher Focus increases Lightning damage and Frost block per orb. Cards like Defragment, Biased Cognition, and Consume increase Focus, though some come with drawbacks. Loop and Capacitor expand the Defect's orb management capabilities by strengthening individual orbs or adding more orb slots.

The Defect's power suite is among the strongest in the game. Echo Form doubles every other card played, creating enormous value over long fights. Creative AI generates random powers each turn, offering infinite scaling potential. Machine Learning provides consistent card draw, while Thunder Strike — while not a power — scales with Lightning orb damage to deliver massive finishing blows.

Defect attack cards often incorporate orb synergies. Ball Lightning, Cold Snap, and Melter all interact with the orb system while dealing damage. The Defect's block options, including Glacier, Reinforced Body, and Equilibrium, provide excellent protection, often generating Frost orbs simultaneously.

88 cards

Adaptive Strike

Rare · Attack · Defect

Deal 18 damage. Add a 0 copy of this card into your Discard Pile.

All for One

Rare · Attack · Defect

Deal 10 damage. Put ALL 0 cards from your Discard Pile into your Hand.

Ball Lightning

Common · Attack · Defect

Deal 7 damage. Channel 1 Lightning.

Barrage

Common · Attack · Defect

Deal 5 damage for each Channeled Orb.

Beam Cell

Common · Attack · Defect

Deal 3 damage. Apply 1 Vulnerable.

Biased Cognition

Ancient · Power · Defect

Gain 4 Focus. At the start of your turn, lose 1 Focus.

Boost Away

Common · Skill · Defect

Gain 6 Block. Add a Dazed into your Discard Pile.

Boot Sequence

Uncommon · Skill · Defect

Gain 10 Block.

Buffer

Rare · Power · Defect

Prevent the next time you would lose HP.

Bulk Up

Uncommon · Power · Defect

Lose 1 Orb Slot. Gain 2 Strength. Gain 2 Dexterity.

Capacitor

Uncommon · Power · Defect

Gain 2 Orb Slots.

Chaos

Uncommon · Skill · Defect

Channel 1 random Orb.

Charge Battery

Common · Skill · Defect

Gain 7 Block. Next turn, gain .

Chill

Uncommon · Skill · Defect

Channel 1 Frost for each enemy.

Claw

Common · Attack · Defect

Deal 3 damage. Increase the damage of ALL Claw cards by 2 this combat.

Cold Snap

Common · Attack · Defect

Deal 6 damage. Channel 1 Frost.

Compact

Uncommon · Skill · Defect

Gain 6 Block. Transform all Status cards in your Hand into Fuel.

Compile Driver

Common · Attack · Defect

Deal 7 damage. Draw 1 card for each unique Orb you have.

Consuming Shadow

Rare · Power · Defect

Channel 2 Dark. At the end of your turn, Evoke your leftmost Orb.

Coolant

Rare · Power · Defect

At the start of your turn, gain 2 Block for each unique Orb you have.

Coolheaded

Common · Skill · Defect

Channel 1 Frost. Draw 1 card.

Creative AI

Rare · Power · Defect

At the start of your turn, add a random Power into your Hand.

Darkness

Uncommon · Skill · Defect

Channel 1 Dark. Trigger the passive ability of all Dark Orbs.

Defend

Basic · Skill · Defect

Gain 5 Block.

Defragment

Rare · Power · Defect

Gain 1 Focus.

Double Energy

Uncommon · Skill · Defect

Double your Energy.

Dualcast

Basic · Skill · Defect

Evoke your rightmost Orb twice.

Echo Form

Rare · Power · Defect

The first card you play each turn is played an extra time.

Energy Surge

Uncommon · Skill · Defect

ALL players gain .

Feral

Uncommon · Power · Defect

The first time you play a 0 Attack each turn, return it to your Hand.

Fight Through

Uncommon · Skill · Defect

Gain 13 Block. Add 2 Wounds into your Discard Pile.

Flak Cannon

Rare · Attack · Defect

Exhaust ALL your Status cards. Deal 8 damage to a random enemy for each card Exhausted.

Focused Strike

Common · Attack · Defect

Deal 9 damage. Gain 1 Focus this turn.

FTL

Uncommon · Attack · Defect

Deal 5 damage. If you have played fewer than 3 cards this turn, draw 1 card.

Fusion

Uncommon · Skill · Defect

Channel 1 Plasma.

Genetic Algorithm

Rare · Skill · Defect

Gain 1 Block. Permanently increase this card's Block by 3.

Glacier

Uncommon · Skill · Defect

Gain 6 Block. Channel 2 Frost.

Glasswork

Uncommon · Skill · Defect

Gain 5 Block. Channel 1 Glass.

Go for the Eyes

Common · Attack · Defect

Deal 3 damage. If the enemy intends to attack, apply 1 Weak.

Gunk Up

Common · Attack · Defect

Deal 4 damage 3 times. Add a Slimed into your Discard Pile.

Hailstorm

Uncommon · Power · Defect

At the end of your turn, if you have Frost, deal 6 damage to ALL enemies.

Helix Drill

Rare · Attack · Defect

Deal 3 damage for each previously spent this turn.

Hologram

Common · Skill · Defect

Gain 3 Block. Put a card from your Discard Pile into your Hand.

Hotfix

Common · Skill · Defect

Gain 2 Focus this turn.

Hyperbeam

Rare · Attack · Defect

Deal 26 damage to ALL enemies. Lose 3 Focus.

Ice Lance

Rare · Attack · Defect

Deal 19 damage. Channel 3 Frost.

Ignition

Rare · Skill · Defect

Another player Channels Plasma.

Iteration

Uncommon · Power · Defect

The first time you draw a Status card each turn, draw 2 cards.

Leap

Common · Skill · Defect

Gain 9 Block.

Lightning Rod

Common · Skill · Defect

Gain 4 Block. At the start of the next 2 turns, Channel 1 Lightning.

Loop

Uncommon · Power · Defect

At the start of your turn, trigger the passive ability of your rightmost Orb.

Machine Learning

Rare · Power · Defect

At the start of your turn, draw 1 additional card.

Meteor Strike

Rare · Attack · Defect

Deal 24 damage. Channel 3 Plasma.

Modded

Rare · Skill · Defect

Gain 1 Orb Slot. Draw 1 card. Increase this card's cost by 1.

Momentum Strike

Common · Attack · Defect

Deal 10 damage. Reduce this card's cost to 0 .

Multi-Cast

Rare · Skill · Defect

Evoke your rightmost Orb X times.

Null

Uncommon · Attack · Defect

Deal 10 damage. Apply 2 Weak. Channel 1 Dark.

Overclock

Uncommon · Skill · Defect

Draw 2 cards. Add a Burn into your Discard Pile.

Quadcast

Ancient · Skill · Defect

Evoke your rightmost Orb 4 times.

Rainbow

Rare · Skill · Defect

Channel 1 Lightning. Channel 1 Frost. Channel 1 Dark.

Reboot

Rare · Skill · Defect

Shuffle ALL your cards into your Draw Pile. Draw 4 cards.

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Refract

Uncommon · Attack · Defect

Deal 9 damage twice. Channel 2 Glass.

Rocket Punch

Uncommon · Attack · Defect

Deal 13 damage. Draw 1 card. When a Status card is created, reduce this card's cost to 0 this turn.

Scavenge

Uncommon · Skill · Defect

Exhaust a card. Next turn, gain .

Scrape

Uncommon · Attack · Defect

Deal 7 damage. Draw 4 cards. Discard all cards drawn this way that do not cost 0 .

Shadow Shield

Uncommon · Skill · Defect

Gain 11 Block. Channel 1 Dark.

Shatter

Rare · Attack · Defect

Deal 11 damage to ALL enemies. Evoke all of your Orbs.

Signal Boost

Rare · Skill · Defect

The next Power you play is played an additional time.

Skim

Uncommon · Skill · Defect

Draw 3 cards.

Smokestack

Uncommon · Power · Defect

Whenever you create a Status, deal 5 damage to ALL enemies.

Spinner

Rare · Power · Defect

At the start of your turn, Channel 1 Glass.

Storm

Uncommon · Power · Defect

Whenever you play a Power, Channel 1 Lightning.

Strike

Basic · Attack · Defect

Deal 6 damage.

Subroutine

Uncommon · Power · Defect

Whenever you play a Power, gain .

Sunder

Uncommon · Attack · Defect

Deal 24 damage. If this kills an enemy, gain .

Supercritical

Rare · Skill · Defect

Gain .

Sweeping Beam

Common · Attack · Defect

Deal 6 damage to ALL enemies. Draw 1 card.

Synchronize

Uncommon · Skill · Defect

Gain 2 Focus this turn for each unique Orb you have.

Synthesis

Uncommon · Attack · Defect

Deal 12 damage. The next Power you play costs 0 .

Tempest

Uncommon · Skill · Defect

Channel X Lightning.

Tesla Coil

Uncommon · Attack · Defect

Deal 3 damage. Trigger all Lightning against the enemy.

Thunder

Uncommon · Power · Defect

Whenever you Evoke Lightning, deal 6 damage to each enemy hit.

Trash to Treasure

Rare · Power · Defect

Whenever you create a Status card, Channel 1 random Orb.

TURBO

Common · Skill · Defect

Gain . Add a Void into your Discard Pile.

Uproar

Common · Attack · Defect

Deal 5 damage twice. Play a random Attack from your Draw Pile.

Voltaic

Rare · Skill · Defect

Channel Lightning equal to the Lightning already Channeled this combat.

White Noise

Uncommon · Skill · Defect

Add a random Power into your Hand. It's free to play this turn.

Zap

Basic · Skill · Defect

Channel 1 Lightning.