It was half a minute after the Faceless Poet had completely vanished.
Only then did the slight trembling sensation in the air, which caused a mild tingling of the skin, finally begin to dissipate.
Even after it had completely faded, Annan still felt crackling vibrations on his skin.
It was like the phantom sounds one might hear in a quiet room after being subjected to continuous noise—
Or like shivering uncontrollably when returning to a warm room after being soaked by the cold wind. It was not a chill on the skin, but rather a liquid "coldness" infused into the bones and flesh.
—This is the "residual."
It is also the origin and true meaning of the name "influence."
If one were to use large-scale Transcendent powers, it would leave scars in the world, creating corresponding influences. This is also one of the prices of using Transcendent powers. Just like Annan's only Twisted Spell... its use would result in influence.