Wave of yellow energy
The people who knew about the Familiars, or had researched them or maybe were around when they were more common, were shell-shocked upon witnessing the scene in front of them.
It was already incredible for a person to have two Familiars, but now, they were stumped upon seeing all four kings linked to a single person, because it was an unprecedented event for everyone at the scene.
Either way, it was something that they didn't have much time to think about. Erin and Laxmus had moved at an incredible speed, and an immense amount of powers clashed at once.
The shockwave from the clash instantly destroyed the last remaining buildings around the area. It was an invisible wave that shook the air itself, and even though the buildings were made from reinforced material from a different planet, not from earth, the aftershock destroyed them.