Macabre constant

Okay kiddo, do you know what "macabre" means? It means something that's really creepy and spooky, like ghosts or scary stories. Now, a "constant" is something that always stays the same. So a "macabre constant" is something that's always spooky or eerie, no matter what. It's like if you went into a dark, old basement and it always gave you the shivers no matter how many times you went down there. That creepy feeling would be the macabre constant.