Any expert on occultism knows what is the word and sound that will reveal them? This is a fragment from the Emerald Tables of Toth

“In the form of man they amongst us,

but only to sight were they as are men.

Serpent-headed when the glamour was lifted

but appearing to man as men among men.

Crept they into the Councils,

taking forms that were like unto men.

Slaying by their arts

the chiefs of the kingdoms,

taking their form and ruling o'er man.

Only by magic could they be discovered.

Only by sound could their faces be seen.

Sought they from the Kingdom of shadows

to destroy man and rule in his place.

But, know ye, the Masters were mighty in magic,

able to lift the Veil from the face of the serpent,

able to send him back to his place.

Came they to man and taught him the secret,

the WORD that only a man can pronounce.

Swift then they lifted the Veil from the serpent

and cast him forth from the place among men.

Yet, beware, the serpent still liveth

in a place that is open at times to the world.

Unseen they walk among thee

in places where the rites have been said.

Again as time passes onward

shall they take the semblance of men.

Called may they be by the master

who knows the white or the black,

but only the white master may control

and bind them while in the flesh”