Divine Spirits basically possess limited divine power.
In Duncan's view, those truly extraordinary beings are only a few, and they are special entities in the Root World who surpass both Zeus and Odin.
Zeus, the main god of the Greek Pantheon, and Odin, the main god of the Norse Pantheon, are essentially gatekeeper-level figures among the gods.
If one is stronger than these two, Duncan would certainly not provoke them easily.
As for the Furious Gods of this world, although some possess mighty divine power, their status is about on par with the Twelve Main Gods of Olympus, akin to opponents that can be challenged head-on but may not necessarily be defeated.
A strong dragon cannot crush a snake on the ground, so it's best to avoid head-on confrontations.
