Boom!
The tremor rolled through the ground like distant thunder, shaking the very foundations of the city walls. The guards patrolling the city gates, where no one but the guards was allowed, tensed.
The tremors ran through the ground and the giant wall they were standing on, coursing through their bodies. They could see dust loosening from the gaps between the bricks, but at the eastern city gate, where the city guards stood, eyes widened and grips tightened; they saw something more.
From beyond the tree line, a sea of sand dust surged forth; the wind howled and blew the dust even farther. Then… they all appeared, Rank 1 spirit beasts, dozens upon dozens, all snarling and howling as one.
"Screeech!" The wind blade eagles screeched through the air, the Ironhide Bulls charged from the ground, letting out misty snorts, their tusks gleaming with metallic shine; Nightflame wolves, with skin of black flames, sprinted towards the city with an unnerving speed.
"Aaaoooo— Aahh— ahh!"