Regen bug

[Mhaeric]

Casting Regen on players with Regen about to fall off sometimes is ineffective in overwriting and renewing the Regen.

Regen is a buff, and like all buffs/debuffs in game is subject to rules about replacement. I.e An existing buff/debuff is replaced by a second cast only if the second cast is equal to or greater in strength than the original. The game does not look at duration at all.

What this means in the case of Regen not replacing is that your first cast was under the effects of a healing potency buff, whether from your own Divine Seal, Eos' Fae Illumination, or a MND boosting potion. The second cast that failed to overwrite it would have been cast after the potency buff has worn off, and thus was weaker in strength. Its also possible that your first cast may have been unbuffed if your second cast was under the effects of a debuff like Determination Down. Any situation that results in a weaker cast of Regen on the second cast will prevent it from overwriting.

Moral of the story: wait until your buff/debuff has fully dropped to avoid clipping of the durations and the possibility of losing one cast entirely like above.