Mystic Codes (魔術礼装, Majutsu Reisō??) (A.K.A. Master Skill) aid your Servants during battle and can be used during any combat preparation phase. Use each skill wisely because they have long cooldowns.
Master Skills change based on the Mystic Code your Master is wearing, and their effectiveness and cooldowns improve as the Mystic Code itself levels up. Initially, only Mystic Code: Chaldea is available, but other Mystic Codes can be obtained by completing special quests in Chaldea Gate.
To change your Mystic Code, go to Party Setup from the 1st Option on the MENU or in the screen before starting a quest; clicking the bottom left button will let you switch your Mystic Code. NOTE: Changing Mystic Code for any parties will not change the Mystic Code Equipped in any other Parties. Please do check before starting a quest.
500% Chance to remove their defensive debuffs. (Defensive Debuffs:Tooltip for 25px|link=ⓘDefense Down/Damage Taken Up, Tooltip for 25px|link=ⓘQuick Resistance Down, Tooltip for 25px|link=ⓘArts Resistance Down, Tooltip for 25px|link=ⓘBuster Resistance Down, Tooltip for 25px|link=ⓘInstant-Kill Resist Down)
Phantasmal Reinforcement
500% Chance to increase one servant's attack for 1 turn.
500% Chance to increase their NP damage for 1 turn.
Protracted Evasion
500% Chance to grant one servant Evasion for 1 attack, 3 turns.
500% Chance to increases one servant's NP damage for 1 turn.
500% Chance to remove their offensive debuffs. (Offensive Debuffs:Tooltip for 25px|link=ⓘAttack Down, Tooltip for 25px|link=ⓘQuick Performance Down, Tooltip for 25px|link=ⓘArts Performance Down, Tooltip for 25px|link=ⓘBuster Performance Down, Tooltip for 25px|link=ⓘDamage Down, Tooltip for 25px|link=ⓘCritical Attack Chance Down, Tooltip for 25px|link=ⓘCritical Damage Down, Tooltip for 25px|link=ⓘNP Damage Down)
Star Blaster
500% Chance to increase one servant's critical damage for 1 turn.
Escape Pod
500% Chance to grant one servant Evasion for 1 attack, 3 turns.
500% Chance to increase one ally's Quick performance for 1 turn.
500% Chance to increase their NP damage for 1 turn.
Campfire
500% Chance to increase party's critical damage for 1 turn.
Survival Kit
500% Chance to remove one ally's Ailment Debuffs. (Ailment Debuffs:Tooltip for 25px|link=ⓘPoison, Tooltip for 25px|link=ⓘBurn, Tooltip for 25px|link=ⓘCurse)
500% Chance to increase one ally's Buster performance for 1 turn.
500% Chance to increase their NP damage for 1 turn.
Pure Coordinate
500% Chance to grant one servant Invincibility for 2 attacks, 1 turn.
Blessed Regenerate
500% Chance to remove one ally's Immobility, NP Seal, and Skill Seal Debuffs. (Immobility Debuffs:Tooltip for 25px|link=ⓘStun, Petrify, Bound, Tooltip for 25px|link=ⓘCharm, Tooltip for 25px|link=ⓘPigify, Tooltip for 25px|link=ⓘAsleep, Tooltip for 25px|link=ⓘEternal-Sleep, Tooltip for 25px|link=ⓘQuick Seal, Tooltip for 25px|link=ⓘArts Seal, Tooltip for 25px|link=ⓘBuster Seal, Tooltip for 25px|link=ⓘNormal Attack Seal) *Does NOT remove Eternal Slumber/Sleep.
500% Chance to increase party's attack for 1 turn.
500% Chance to increase party's NP damage for 1 turn.
Front-Line Recovery
Recovers one servant's HP.
500% Chance to remove their offensive debuffs. (Offensive Debuffs:Tooltip for 25px|link=ⓘAttack Down, Tooltip for 25px|link=ⓘQuick Performance Down, Tooltip for 25px|link=ⓘArts Performance Down, Tooltip for 25px|link=ⓘBuster Performance Down, Tooltip for 25px|link=ⓘDamage Down, Tooltip for 25px|link=ⓘCritical Attack Chance Down, Tooltip for 25px|link=ⓘCritical Damage Down, Tooltip for 25px|link=ⓘNP Damage Down)
Order Change
Exchanges the party positions of one servant in the field and one sub servant.
500% Chance to increase one ally's Buster performance for 1 turn.
Recovers their HP.
Observing the Boundary
500% Chance to reduce one enemy's Instant-Kill resistance for 1 turn.
Gain critical stars.
Sunset in the Classroom
500% Chance to remove one ally's Mental Debuffs. (Mental Debuffs:Tooltip for 25px|link=ⓘAsleep, Tooltip for 25px|link=ⓘBewitchment, Tooltip for 25px|link=ⓘCharm, Tooltip for 25px|link=25px|link=ⓘCharm Resistance Down, Tooltip for 25px|link=25px|link=ⓘConfusion, Tooltip for 25px|link=ⓘEternal-Sleep, Tooltip for 25px|link=25px|link=ⓘTerror)
500% Chance to increase one ally's NP damage for 1 turn.
500% Chance to increase their NP generation rate for 1 turn.
Powder Snow
Recovers one ally's HP.
500% Chance to remove their Ailment Debuffs. (Ailment Debuffs:Tooltip for 25px|link=ⓘPoison, Tooltip for 25px|link=ⓘBurn, Tooltip for 25px|link=ⓘCurse)