The Swords of Despair are Ganondorf's default weapon in his Great Swords moveset in Hyrule Warriors and Hyrule Warriors Legends.
Befitting its wielder's evil nature it has a Darkness Elemental Attribute.
A variation of these swords appear with Ganondorf's Yuga Ganon colors called the Swords of Renewal, which has both light and darkness elemental attributes.
Render of Ganondorf (Era of Twilight Armor) holding one of his Swords of Despair from Hyrule Warriors
Ganondorf (Era of Twilight Armor) wielding his Swords of Despair in his victory cutscene from Hyrule Warriors
Theory warning: This section contains theoretical information based on the research of one or several other users. It has not been officially verified by Nintendo and its factual accuracy is disputed.
One of the swords resembles the design of the large sword wield by Ganondorf in the The Legend of Zelda: Space World 2000 Demo and Super Smash Bros. Melee.