Eternal Suffering not work as intended

[fateriddle]

Eternal Suffering(doombringer): Your strikes are imbued with a vile power that extends your victim's suffering. When hitting in melee, you have a 59% chance to extend the length of all negative effects and reduce the length of all positive effects on the target by 4 turns. This effect can only trigger on any particular target once every 6 turns.

It could be really powerful if work as intended: you apply debuffs, then Eternal Suffering. But since it is a sustain that trigger on melee attacks, it is more than likely to trigger on your first hit, your foes will be applied some debuffs on that hit along with a "suffered" debuff of 7 turn, which prevent you to apply Eternal Suffering on it for the next 7 turns.

For example: your first hit applied flameshock 3, slow 4, burn 4. If Eternal Suffering triggers on next turn, it will become flameshock 6, slow 7, burn 7. But if Eternal Suffering apply on the same turn, none of the debuff's duration extend, and you won't be able to do so for the next 7 turns because of "suffered" debuff.

So it doesn't really help at all most of the times.

[Razakai]

Might be worth changing ES to only trigger when the target has at least one debuff on them. That's the most simple workaround I can think of.