Creating Magic Item Effect

[cheezeninj4]

So no big deal if this isnt possible but I am trying to create an item that grants a +2 to saving throws only when the throw fails. I was wondering if in the Spell Effect description/condition/modifiers box, if there were any conditions that would create this effect.

if this isnt possible i'll just have to ignore the bonus if it succeeds during gameplay.

[Zacchaeus]

I'm not sure I understand the principle here. You want a +2 bonus only if the save fails? Can I ask why?

You can add a number to a save using SAVE: 2, <ability> If you miss out the ability then the bonus will apply to all saves. You can also chain abilities to narrow the save down to just some abilities such as SAVE: x, dexterity, wisdom.

You can't however test to see whether a save failed or by how much it failed before you add in a bonus.

[damned]

mechanically applying the bonus only to fails is the same as applying the bonus to all rolls...

[Trenloe]

We need to know the use case. Maybe there's an ability that can be used a certain number of times per short rest that allows a save failed by 1 or 2 points to be passed? I'm just guessing though...