Chaos Sphere

An artifact known as the Chaos Sphere has at times been used, mainly in Hexen and Hexen II, as a source of extra power for the Serpent Riders.

In Hexen, the Chaos Sphere is assumed to be a major source of power for Korax. When the player acquires it after defeating Korax, he is whisked away to the Realm of the Dead, occupied by Korax's warriors. This suggests that one of its abilities may be interdimensional travel. Eventually the player returns to the world where the Chaos Sphere is kept, determined to claim it despite all endured hardships. It remains unclear what happens afterwards.

The Sphere plays no active role in the battle against Korax in Hexen; however, in Hexen II, the player will encounter it after defeating the smaller and weaker form of Eidolon, causing the eldest Serpent Rider to grow to mass proportions. It has 2000 hit points here, and must be destroyed; otherwise, Eidolon will remain invulnerable to any attacks.

An artifact that may be related to the Chaos Sphere appears in the Hexen II mission pack Portal of Praevus - the Sphere of Order. Though it has a similar outer appearance as the Chaos Sphere, it does not display any specific powers and the connection between the two remains ambiguous.