Effect Duration Boost is an effect that can either extend the turn duration of certain buffs or reduce the turn duration of specific debuffs.
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:
A Feast of Tears generally reduces the duration of the above effects by 2 turns while present. Exceptions to this include the following:
- Negative potencies of Effect Duration Boost are known officially as "Magic Nullification".
- 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.