Common Keys

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Common Keys (also called Universal Keys) are equipped on T-Dolls to provide stat boosts, and in the case of yellow keys, extra effects.

Common keys are obtained during events, by completing the Neural Helix of a T-Doll or by reaching Bond 5 with a T-Doll. They're equipped on the right side of the Key Regulation menu.

List

From events

Name	Rarity	Event	Effects
The Force of Bravery	Purple	Sojourners of the Glass Island	Attack Boost +3% Defense Boost +3%
Rubber Pig	Purple	Sojourners of the Glass Island	Attack Boost +3% Defense Boost +3%
Fortress Gatekeeper	Blue	Sojourners of the Glass Island	Attack Boost +2% Defense Boost +2%
Pixie Cape	Purple	Sojourners of the Glass Island	Attack Boost +3% Defense Boost +3%
Delicious Canned Herring	Blue	Sojourners of the Glass Island	Attack Boost +2% Defense Boost +2%
Teddy Bear Costume	Purple	Rhapsody Quartet	Attack Boost +3% Defense Boost +3%
Caramel Overload	Blue	Rhapsody Quartet	Attack Boost +2% Defense Boost +2%

From Neural Helix

Name	Rarity	T-Doll	Effects
Survival Instinct	Yellow	Makiatto	Attack Boost +5.0% At the start of the action, if own HP is greater than 80%, reduces stability damage taken from attacks by 2 points. This can trigger at most once per turn.
All Seeing Eye	Yellow	Mosin-Nagant	Attack Boost +5.0% When this unit is under the effects of Insight, increases damage dealt by 7%.
Brilliant Medal	Yellow	Papasha	Attack Boost +5.0% Increases damage dealt by allied units' support skills (excluding self) by 10%. Can trigger at most once per turn.
All Points to Damage	Yellow	Peritya	Crit Rate +2.0% If an active skill hits 2 or more enemy targets, damage dealt is increased by 7%.
Strategic Negotiation	Yellow	Qiongjiu	Crit Rate +5.0% Increase damage dealt outside of the unit's own turn by 7%.
Hot Oil Protection	Yellow	Sabrina	Defense Boost +5.0% When dealing targeted damage, applies Movement Down II to the target for 1 turn.
Mission's Blessing	Yellow	Suomi	Defense Boost +5.0% When HP drops below 80%, restore 15% of this unit's maximum HP and gain Defense Up III for 2 turns. Can trigger only once per battle.
Afterglow	Yellow	Tololo	Attack Boost +5.0% When Confectance Index is below max, increases damage dealt by 7%.
Mangle	Yellow	Ullrid	Crit Rate +5.0% If the enemy target's HP is not full before the attack, increase damage dealt to them by 7%.
Heart Melting Strike	Yellow	Vepley	Attack Boost +5.0% If the user's Mobility is greater than or equal to the target's, increases damage dealt by 7%.

From Bond

Name	Rarity	T-Doll	Effects