The Concurer Worm from the book Clockwork Princess

 And much of madness

And more of sin

and horror the soul of the the plot

-edgar Allen Poe 'The Concurer Worm'

Setting:

(Gideon, Gabriel, Will, Jem, Cecily, and Tessa all standing in Chisick Ornimental Italian Garden to hunt Benedict Lightwood whom has turned into a demon worm due to the progression of Demon Pox contracted from indecent relations with demon women)

"The gardens run around the house down to the river I ought to know I chased the demon Marbus all up threw here one night. Wherever Benodic is I doubt he'll leave these grounds to much chance to be seen." (Mentioned Will)
(Tatiana burst from the gardens and ran straight into will's arms then this)

Tatiana Describes her father the worm attacking her husband:

(Even though Tatiana was tear stained and gasping there was something theatrical about the way she does describe it)

Tatiana:

"A great monster a creature it seized darling rupert from the carrage and made off with him."
Will:

"What do you mean made off with him?"
Tatiana:

(She pointed) "There!" (she sobbed) "It dragged him to the Italian gardens he managed to illude it's more at first but it haired him threw the paths but no matter how much I screamed it would not put him down!"(she burst into a fresh fit of wales)

Will:

"you screamed? is that all you did?"
Tatiana:

"I screamed a great deal"(Tatiana sounded injured she drew fully away from Will and fixed him with a green gaze) "I see you are as ungenerous as you ever were"(Her eyes skated to tessa cecily and jem)

"Mr Carstairs"(She said as if they were at a garden party)

Will and Jems discussion while hunting the Demon Worm Benidict Light wood.

Will:

"A fourty foot worm" (Will muttered to jem as they moved threw the Italian garden. Their boots, thanks to the soundless runes, making no noise in the gravel.) "Think of the size of the fish we could catch"
Jem:

(Jems lips twitched)"It's not funny you know"
Will:

"'Tis a bit"
Jem:

"You cannot reduce the situation to worm jokes Will this is Gabriel and Gideon's father we're discussing."
Will:

"We're not just discussing him were chasing him threw an ornamental sculpture garden because hes turned into a worm."

Jem:
"A demonic worm" (pausing to peer cautiously around a hedge row) "A great serpant would that help

your inappropriate humor?"
Will:

"There was a time when my innapropriant humor brought you a certain amusement" (sighed will) "how the worm has turned."

Jem:
"Will"

(jem was interrupted by a scream)

(Tatiana lost her mind and broke into hysterics behind them,  as she looked upon the booted foot of her husband with a ragged stump of an ankle protruding out fron the top of the boot, which was all that was left of him. Tatianas husband Rupert Blackwell was eaten by Tatians father Benedict Lightwood aka the giant demonic worm.  Rupert was eaten just before all the others showed up because Tatiana and Rupert, not knowing the state of Benedict Lightwood, were paying a house visit to him.)

Just after the group finds The Giant Demonic Worm:

(Suddenly Benedict reared up like a cobra. Gideon's looked incredibly small against the creatures vast bulk.)

Gabriel:

"Gideon!" (yelled Gabriel whiteface raising his bow)

(Will spun aside as an arrow flew past him and buried itself in the worms body. The worm yelped and spun humping its body away from them with incredible speed. As it slithered away A flick of its tail caught the edge of a statue squeezing it tightly. The statue exploded into dust showering into the dry ornamental pool.)
Will:

"By the angel it just crushed sophocles" (noted Will as the worm vanished behind a large structure shaped like a Greek temple.) "Has no one respect for the classics these days"

How the Worm has turned ;)