The boon Summoned creature says:
You create or summon a temporary NPC companion that is under your control, though of limited intelligence. Your minion's statistics are determined by the power level of this boon. You may assign the attributes as you see fit among the following: Agility, Fortitude, Might, Perception, Energy, and Entropy. (...) On each of your following turns, your minion acts on your initiative count according to your direction, receiving the usual assortment of actions.
As Energy and Entropy are both attributes for Summon Creature, can they summon creatures as well?
For instance, if my Energy score is 9, and I dual cast it to get two beings with energy score 7, can they make a creature with Energy 5, and they make a creature with Energy 3? If so, now I have 6 creatures that can each inflict Persistent Damage, which is a lot of damage (this is assuming everything boon cast works).