Sword of Darkness, Dark Sword or Darkblade is a weapon that appears in several Shining games.
In the fight against him in Dragonia, Kane has the Sword of Darkness equipped. Later, while Max is talking to King Kusuko in Prompt, Otrant appears and tells them that the Sword of Light and the Sword of Darkness are required to create the Chaos Breaker, so King Kusuko gives it to Max. The Sword of Darkness is a cursed weapon that gives 40 attack points and casts Desoul level 1 when used.
This sword is not the same as the Sword of Darkness from the previous game. In the fight against the Red Baron, he has the Dark Sword equipped. Later, Lemon is found in Yeel attempting suicide, then he joins with the Dark Sword equipped. The Dark Sword is a cursed weapon that gives 50 attack points and casts Desoul level 1 when used.