Triggers are a core gameplay mechanic in Granblue Fantasy. Triggers activate when certain conditions are met and then change a foe's natural behavior, whether through use of Special Attacks, phase changes or filling up a foe's charge diamonds.
There are multiple types of triggers in raids.
Special Attack Triggers
Special Attack Triggers (SATs) are triggers that force a foe's Special Attack.
Charge Diamond Triggers
Charge Diamond Triggers (CDTs) are triggers that only activate after a skill or attack is used. As such, they can only be activated during the player's turn.
Phase Change Triggers
Phase Change Triggers (PCTs) are triggers that change the move-set and/or properties of the foe.
Encounter Triggers (ETs) are triggers that only activate the first time a raid is loaded. As such, they can only activate once. Most ETs can only be activated as the Discoverer.
Health Triggers (HTs) are triggers that only activate when the foe reaches a certain health threshold. HTs are always locked to their own respective phase. Health being refilled will ignore HTs that have already been performed unless otherwise stated.
Status Triggers (STs) are triggers that only activate when an ally or enemy has a certain status active. These are most notable in Celeste Omega.