Instant Affect

From IvaPedia

There are two types of affects persistent in Ivalice. Common to many other MU*, there is a tick affect, then there is Ivalice's 'Instant Affect'. These are affects that trigger once per round (approximately every 3 seconds).

The most common spell that benefits from this type of affect are DoTs (Damage over Time) and HoTs (Heal over Time), such as a Fire proc, or a Regen spell.

Some affects are buff based, and increase, for example, strength - the bonus is persistent, not cumulative. That is, you will gain 10 strength for the duration of the spell, not 10 strength every round.