In Norwegian folklore, a deildegast is a type of ghost connected with the sanctity of boundary stones, and what happened to those who dared to move them.
After dying, the deildegast was forced to haunt the area near the boundary stones until he was able to lift it back to its correct place.
This feat proved impossible, however, as the stone would always slip, causing the deildegast to emit a sorrowful scream before trying again to no avail.
Often having died many years ago, the deildegast wore the clothes of its own days, which often meant that they looked very outdated to those that saw it.
The threat of becoming a deildegast deterred any attempt at tampering with border stones, keeping land disputes under control.