Ability score for the concentration checks for the spell-like abilities

[Adjoint]

Quote:

A spell-like ability has no verbal, somatic, or material component, nor does it require a focus. The user activates it mentally. Armor never affects a spell-like ability’s use, even if the ability resembles an arcane spell with a somatic component. A spell-like ability has a casting time of 1 standard action unless noted otherwise in the ability or spell description. In all other ways, a spell-like ability functions just like a spell.

Since concentration isn't mentioned, I understand taht the spell-like abilities do require concentration checks in the same situations that spells do.

My question is: what is the ability score used to modify the roll?

My bet would be that it's always Charisma, it is usually used for the DCs after all, but on the other hand, the number of daily uses of abilties granted by class features often depend on other ability scores, like Intelligence or Wisdom.

[Nefreet]

The saving throw (if any) against a spell-like ability is 10 + the level of the spell the ability resembles or duplicates + the creature's Charisma modifier.

[Nefreet]

But, as with most abilities, that's the default DC. Some abilities specifically call out using a different attribute to determine the DC.

[Chemlak]

The question is Concentration checks, not save DC.

I’d also rule Charisma, unless someone has a compelling reason not to.

[Nefreet]

Oh. Indeed. Go with whatever attribute you used to determine the DC. Sorry I missed that.