The "Crystal Shard" is a fictional magical artifact from the Forgotten Realms campaign setting in Dungeons & Dragons. It is known for its powerful abilities and is often sought after by adventurers and villains alike. The shard is associated with the demon lord Crenshinibon, who uses it to manipulate and control others. In the lore, the Crystal Shard is a source of immense power, granting its wielder various magical abilities. It is featured prominently in the novel "The Crystal Shard" by R.A. Salvatore, which follows the adventures of the character Drizzt Do'Urden as he confronts the dangers posed by the shard and its dark influence.