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These questions address the spell-like abilities of certain outsiders to summon "allies" -- for example, the ability of a bearded devil to summon either another bearded devil, or 6 lemures. These spell-like abilities are assigned percentage chances of failure (not a DC for a d20 roll).
1. Do these percentages increase if the creature is advanced? If so, by how much? Are they based on an ability score, such as Charisma?
2. Are these chances of success subject to increase or decrease due to general buffs or debuffs like inspire competence or prayer?