Summon Companion (Feat)

Prerequisites: Caster Level 21, Cha 23, Summoning Perfection (Feat), Prolonged Summons (Feat)

Benefit: Once per day, when you summon a monster or monsters with any Summon Monster spell you possess, the creature(s) summoned remain in your service for one hour per caster level. If you use this feat again before the previous duration expires, then the creatures remain for another one hour per caster level. This may be continued indefinitely.

Creatures summoned when this feat is used are treated in all ways as if they were druidic companions, although they do not level up, etc.