Although the majority of Ancient Yinduo Spirits are low-level, when too many Sound Spirits are crowded together, their instincts drive them to fuse and devour each other, like two drops of water sticking together, forming a larger and fuller droplet.
The air is filled with chaotic and twisted sound waves, like countless beasts roaring in one's ears, or like a poorly skilled orchestra playing haphazardly, buzzing and making one feel agitated.
In places where only Sigel can observe, he sees several massive energy clusters endlessly swelling, from which faint black lights emerge, exuding a sense of unease, as they are nurturing higher-level Ancient Yinduo Sound Spirit monsters.
This is the terrifying aspect of the Echo Tide, where the overly dense Sound Spirits can easily give rise to Level 4 or above ancient demonic spirits, enough to threaten a Dawn Wizard.
Sigel stood in place, his eyes flickering constantly.
