Found in the Road of Sacrifices on what once was the eastern access to the keep. The area can be reached by following the eastern shore of the marsh, fighting a couple of Lycanthropes along the way. The coal can be found at the end of a blocked passageway, guarded by a Black Knight.
- Heavy Gem: Allows to infuse weapons with the Heavy attribute.
- Sharp Gem: Allows to infuse weapons with the Sharp attribute.
- Poison Gem: Allows to infuse weapons with Poison.