The state or condition of being macabre.

Representing or personifying death. / Obsessed with death or the gruesome. / Ghastly, shocking, terrifying.

In a macabre manner

(art) A conventional subject in art, literature and drama, or a particular work in that style, in which death (in the form of a putrid corpse, skeleton, the Grim Reaper, etc) is shown leading people to the grave.