The cacodemon has a 35% chance to summon 1d3 derghodemons (see Tome of Horrors 5e) or a cacodemon. The summoned demon appears in an unoccupied space within 60 feet of the cacodemon, but can't summon other demons. It remains for one minute, until it or the first cacodemon is slain, or until the first cacodemon takes an action to dismiss it.