Tacet Discords attack other living beings, because they need to feed on those frequencies to make themselves whole again. When frequencies are scattered and recombined, a new Tacet Discord is born. Tacet Discords are classified according to the concentration levels of their characteristic frequencies.

Generally, Tacet Discords with higher concentration levels are considered to pose greater threats. The current classification levels, from lowest to highest, are Common, Elite, Overlord and Calamity. Additionally, there is a special type of Tacet Discord, and we call them the Threnodians. These entities are seen as sources of destruction and embodiments of chaotic energy.

To sustain itself, the Tacet Discords possess an instinctual drive to consume and merge with other frequencies, in a constant battle to maintain its existence. Upon its demise, the frequencies of a Tacet Discord will not immediately vanish. Instead, they will slowly decay over time, allowing for their capture and utilization.

Once enough frequencies have been stored, they can be harnessed to replicate the abilities of the original Tacet Discord. This remaining energy, capable of emulating the defeated entity's power, is known as an Echo