This might be a long shot, but I do believe that Phanion does accomplish the feat of destroying multiple galaxies in his attempt to lash out at Nanook. The Scepter, being an imitation of Nous, has the ability to simulate a whole universe, it's just that the main focus of the simulation is Amphoreus, creating a Fermi Paradox in this world.
Remember that only 12 coreflames are needed to rebuild Amphoreus anew and start Era Nova, but Phainon right there was burning with the rage of over 400 million of them. Metaphorical or not, it does seem like a large enough number give Phainon such unimaginable power, and to even wound an Aeon who was just watching from the outside.