Though faster and more powerful, these Heartless are otherwise the same as the Invisible. They attack with a fearsome shockwave. Time your combo finisher so it connects right after they catch their sword. This will cancel the shockwave and leave them open.
Roxas and Xion separately encounter an Orcus on Day 352 in Halloween Town and fight it, but Axel reveals that the Orcus was not real, and that Xemnas had tried to pit the pair against each other by casting an illusion on them so that they saw each other as the Heartless. It is also one of the six bosses Roxas was sent to exterminate.
An Orcus is a muscular, humanoid creature with dark purple skin. The tips of its feet are red, and it has small, dark grey wings on its back. It also has an orange wing on each of its elbows. It has a long tail that ends in a silver, circular, pendulum-like blade.
Its small eyes are glowing yellow, and its head features two large, conical, dark purple spikes on either side. It also has two horns with orange tips on its head that connect to each other to form a heart shape. It also carries an ornate, orange sword with a grey cross guard, black edges, and the kanji for "hard shell" printed on its shaft.
The name "Orcus" references the a Roman god of the same name, who was frequently associated with the Underworld and death. Its Japanese name, "Ogre", carries a similar meaning, as the word "ogre" is believed to be derived from the name "Orcus".