The Grail of Eternal Life is a mod for Spear of Destiny, made by Marcus Svensson in collaboration with Havoc. It was released on January 4, 2005. Though only one version was released it held the distinction v1.0.
The mod features 20 new levels and many new graphics in addition to an atmospheric set of coding changes property of Havoc, which include outside atmosphere, textured floors and ceilings and new weapons.
Level design varies in size, though some are quite small and compact.
The mod was eventually given a reboot which was released in 2018 after having been in the works for a long time; Operation: Gral.