A carapace is a dorsal (upper) section of the exoskeleton or shell in a number of animal groups, including arthropods, such as crustaceans and arachnids, as well as vertebrates, such as turtles and tortoises. In turtles and tortoises, the underside is called the plastron.
In cases of speech and sayings, it may be used as a replacement for the word shell.
"The carapace of these turtles lacks scutes and is covered instead with a leathery skin."
"I don't blame him for building a carapace around his true self"
the protagonist ( representing death ) in the novel and 1993 animated movie "THE HALLOWEEN TREE". The movie dipicts said character as having a greenish yellow color and knowing all sorts of facts about past Halloweens and death rituals. plus, he has magical powers