A moonlit graveyard plundered by powerful necromancers. Art by Yang Qi

Skeletons

Mostly based on mythology

Skeletons have many myths from all around the world such as the Mexican sugar skulls, but most depictions of skeletons in d&d are based off of the grim reaper from the middle ages. Its described as a skeleton draped in tattered black and blue robes holding a scythe and or an hourglass. In d&d, skeletons are long decayed corpses risen from the dead by necromantic magic, usually wearing armor scraps and carrying a short-bow and short-sword.

In Mythology

The dance of death made in 1493 by Michael Wolgemut