Accuse Groundskeeper

Ned Tuttle is enraged. He begins to chant in a strange language. The silhouette of an enormous creature can be made out in the fog with dark scales and a long tongue. A foul stench fills the air and you struggle to focus. It is then you remember the box that the Librarian gave to you. Quickly, click the magical box below to seal the creature’s name into the box.

Hopefully you have gathered the letters from the clues in time!