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card
defect
power
rare
Biased cognition is single-handedly the most powerful defect card for hallway fights. It is extremely fast acting, cheap, and has no downsides until turn 5. It is comparable to Wraith Form: you do not want to play this until you are sure that combat will be over before its effect wears off. This makes it a bit of a gamble in boss fights, but its benefits greatly outweigh its downsides. I would always recommend picking up at least one copy of this card. If you have any ways of getting artifact, the downside of this card can be fully negated making it incredibly powerful. Furthermore, orange pellets can remove the focus down debuff, and since this power is so cheap it is very easy to consistently pull this off on the turn that it is played.

Cracked Core
starter
At the start of each combat, Channel 1 Lightning.
C

Data Disk
common
Start each combat with 1 Focus.
B+

Gold-Plated Cables
uncommon
Your rightmost Orb triggers its passive an additional time.
B+

Symbiotic Virus
uncommon
At the start of each combat, Channel 1 Dark.
B-

Emotion Chip
rare
At the start of each turn, if you took any damage last turn, trigger the passive ability of all your Orbs.
B-

Inserter
boss
Every 2 turns, gain 1 Orb Slot.
A

Nuclear Battery
boss
At the start of each combat, Channel 1 Plasma.
B+

Runic Capacitor
shop
Start each combat with 3 additional Orb slots.
B

Frozen Core
boss
Replaces Cracked Core. If you end your turn with empty Orb slots, channel 1 Frost.
A-

Frozen Egg
uncommon
Whenever you add a Power card to your deck, Upgrade it.
B+

Mummified Hand
uncommon
Whenever you play a Power, a random card in your hand costs 0 for the turn.
A-

Bird-Faced Urn
rare
Whenever you play a Power, heal 2 HP.
A-

Gambling Chip
rare
At the start of each combat, discard any number of cards then draw that many.
A-

Stone Calendar
rare
At the end of turn 7, deal 52 damage to ALL enemies.
C+

Clockwork Souvenir
shop
At the start of each combat, gain 1 Artifact.
B