Summon Allies
The creature can attempt to summon creatures of the same creature type as itself as a full action. The summoned ally cannot summon its own allies, is worth 0 experience points, and returns to the place from which it came after 1 hour.
Format: Spell-Like Abilities 1/day—summon allies (1 imp 60%).
Guidelines: Choose either a creature of the same CR as the monster (with a 35% chance of success) or a creature with a CR no greater than the monster’s CR – 5 (with a 60% chance of success).
Source
Alien Archive pg. 152