Graves or Mounds are world objects that can be found singularly in forests or in a large group in a graveyard (which is characterized by a large shroud of fog). They may be found with or without a nearby Headstone, though graves without headstones can only be found in actual graveyards.
Each grave dug with a Shovel has a 10% chance to spawn a Ghost. Otherwise, the player gets a Gravedigger Item, Blue Gem, Red Gem, Gears, or Nightmare Fuel. If no Ghost is spawned, it has 10% chance to be an Amulet, otherwise it will be one of the remaining items with equal probability. Once dug, the grave will not respawn, and each world has a limited number of them.
Digging a grave takes 4% of your shovel durability (equivalent to 1 digging actions) or 1% if using a Regal Shovel .
Each grave dug causes the player to lose 10 points of Sanity.