There’s a little irony in Eternal Silence being stuck on a looping sound bite.— Harry Dresden on Eternal Silence’s limited speech.
He was tall and menacing floating three feet in the air. He wore a rich cloak, hood up with a black shadow inside it. His cloak billowed similar to a lava lamp.
In the series Edit
In Ghost Story, Eternal Silence told Harry Dresden that he "must understand his path. That before you. That behind." and "It is essential to survival." and that more than he should say. Dresden asked survival who, Eternal Silence said: "EVERYONE" very loudly. Then he screamed more messages inside Dresden's head. Dresden stopped him. And then Eternal Silence just repeats himself.
Later, when the Leanansidhe was about to answer Dresden's question about who killed him, Eternal Silence warns her not to. And when she gave Dresden three true answers about his killer's identity Eternal Silence admonishes the Leanansidhe for saying too much in that really loud screaming voice. Eternal Silence's voice is the same as the Demonreach Entity's voice.