What are the behavior details for the [Enfeeble] debuff?

The amount that the ATK of a character afflicted with [Enfeeble] will decrease by is not calculated from their Pre-Increased/Decreased Stat, but from their In-Battle Stat.
In addition, the effect of [Enfeeble] will not be affected by the timing in which it was afflicted, instead being continually calculated based on the current increased/decreased ATK of the afflicted character.

・Pre-Increased/Decreased Stats:
A character's stats in their initial states, before any stat-increasing/decreasing buffs, debuffs, etc., are applied to them during battle.​
・In-Battle Stats:
A character's stats in their current states,​ after all stat increases/decreases have been applied to them during battle.​

Calculations for an In-Battle ATK stat of 1000:

⇒If a 20% [Increased ATK] buff and 50% [Decreased ATK] debuff are applied to it: 700
・1000 × (1 + 0.2 - 0.5)
= 1000 × 0.7
= 700

⇒If a 20% [Increased ATK] buff, a 50% [Decreased ATK] debuff, and a 30% [Enfeeble] debuff are applied to it: 490
・(1000 × (1 + 0.2 - 0.5)) × (1 - 0.3)
= (1000 × 0.7) × 0.7
= 700 × 0.7
= 490

・If a 20% [Increased ATK] buff and 30% [Enfeeble] debuff are applied to it: 840
・(1000 × (1 + 0.2)) × (1 - 0.3)
= (1000 × 1.2) × 0.7
= 1200 × 0.7
= 840

・If, on the next turn, the [Increased ATK] buff is dispelled, and only the 30% [Enfeeble] debuff is applied to it: 700
・1000 × (1 - 0.3)
= 1000 × 0.7
= 700