Effect Duration Boost

Effect Duration Boost is an effect that can either extend the turn duration of certain buffs or reduce the turn duration of specific debuffs.
For example, Nia, Maverick of Elysia's Extra Skill effect reduces the duration of the Turn Skip debuff by 3 turns. This makes her immune to any Turn Skip effects that last for less than 3 turns.
==Buff Application==
If a unit's buff were to have its effect duration reduced to 0 turns, the effect will not apply at all. This also means a buff with an effect duration of 0 turns cannot overwrite pre-existing buffs.
For example, if Damage Mitigation effects have their effect duration reduced by 2 turns, Reborn Íkaros Azius' 3-turn mitigation effect on SBB will only last for 1 turn. If Divine Savior Mikael's 2-turn mitigation effect on SBB were to activate, Mikael's mitigation effect will not overwrite Azius' mitigation effect.
==A Feast of Tears==
Certain quests have invisible enemies usually named A Feast of Tears. These are not meant to be targeted, as they cannot be targeted without scrolling through each enemy that appears in battle while checking enemy buffs. Additionally, they have Damage Immunity and Stealth effects active throughout the entire fight. When present in battle, they reduce the buff turn duration of the following effects:
Buff 	Buff Icons
Damage Mitigation 	
Elemental Mitigation 	
Evasion 	
Parameter Boost 	
Self Parameter Boost 	
Elemental Parameter Boost 	
Parameter Conversion 	
Self Parameter Conversion 	
Spark Boost 	
Self Spark Boost 	
Elemental Spark Boost 	
Critical Damage Boost 	
Elemental Critical Damage Boost	
Elemental Damage Boost 	
Gradual BB Gauge Boost 	
BC Fill when attacked 	
BC Fill on Spark 	
BC Efficacy 	
OD Gauge Fill Rate 	
Gradual OD Fill 	
A Feast of Tears generally reduces the duration of the above effects by 2 turns while present. Exceptions to this include the following:
Effect 	Content
3-turn reduction	
*All Grand Quest: The Echoing Void Hard Mode episodes if Elemental Exploit is used
4-turn reduction	
*Battle 5 of Frontier Spire's Unknown Sector
**Occurs only if A Feast of Tears is present while Phantom Ensa-Taya is alive
**Multiple copies of A Feast of Tears can be summoned, causing effect durations to be reduced by an additional 2 turns for each A Feast of Tears present
==Trivia==
*Negative potencies of Effect Duration Boost are known officially as "Magic Nullification".
**In the news announcement of the initial Guild Event run of Frontier Rift: Heaven's End, it is noted by the developers that players are encouraged to use mono-element squads to utilize Paradigm 3 effects from Elemental Paradigm.
*Omni +3 units use this passive for Elemental Paradigm to extend the buff durations of Parameter Boost, Damage Mitigation, Elemental Mitigation, Additional Damage Reduction, Elemental Damage Boost, Critical Damage Boost, Spark Boost and Spark Critical effects by 1 turn.
*Some enemies have this passive to reduce the duration of specific buffs during the encounter.
**The most notable buff is Damage Mitigation, which is often reduced by 1~2 turns in most Frontier Rifts, many Vortex quests (such as quests from Scrolls of Urzyma and Battles of Brave Frontier 2), and Global Exclusive Grand Quests from Everlasting Embrace onward.