Covenant, well aware of Galloway's reputation for dealing with occult matters, is in failing health and raves about a curse that has destroyed his entire family.

Galloway decides to honour his friend's wishes by trying to stop whatever was set in motion long ago at the ancient stones where the ritual was performed.

Through the Covenants' journals and Galloway's own memories, the player learns more about the nature of the curse and the creature behind it: the Undying King, a powerful demonic presence threatening to destroy the reality we inhabit.

While attempting to prevent the Undying King from entering our world, Patrick must face off against the four undead Covenant siblings as well as Count Otto Keisinger, an evil rival who simply wants to gain power from the demonic forces.

As Patrick begins to unravel the mysteries of the Covenant family, he finds himself travelling throughout both time and space, traversing both the ancient past and other dimensions entirely.

Demanding the Gel'ziabar Stone that Patrick carries in exchange for Jeremiah's life, Ambrose still beheads his sibling after he has gotten it, turning himself into a hulking ogre-like monster.

Enraged at his friend's treachery, Patrick beheads Jeremiah, but this proves to be a mistake, as with the last Covenant slain, the seal is broken, and the Undying King is released.

A sequel hook is added by a mention that after researching the brotherhood of monks, Patrick learns that they had monasteries at similar sites all over the world, and he realizes that this is just one of many coming trials.

Another aspect of the gameplay of Undying - and one which gives it a similar ambience to traditional role-playing video games - is that along with its set of offensive weapons, the player is able to use a wide range of magical spells.

Spells consume a certain amount of Galloway's magical energy, or "Mana", which is represented by a flask icon and corresponding number on the bottom center-right of the screen.

Also, as is common with first-person shooters, combat is interspersed with simple puzzle-solving elements which usually involve overcoming an obstacle (such as a locked door) which impedes the player's progress through the game.

[10] Star Dingo of GamePro said, "It would've been simple to turn Undying into a straightforward first person shooter, an alternate version of Unreal, only with more gothic castles, werewolves, and European accents.

Instead, the careful craftsmen at DreamWorks [sic] have forged a complex, gothic horror story, pushing Undying far beyond the level of mere Quake-copycat.