
daedel, el azote |

Bump! Redoing the question, because maybe it's not clear: if a monster tries to use one of his spell-like abilities, provoking an attack of opportunity, and uses a concentration check to avoid losing it, what is the ability that you add to the caster level? For saving throws is Charisma so I suppose it's the same but I'm unsure that's correct.

concerro |

SLA's use charisma.
Univeral Monster Rules wrote:
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.
edit:A creature always uses his primary spellcasting attribute when making concentration checks.