Hexen: Beyond Heretic is a 1995 first-person shooter with action-adventure and action role-playing elements. It is the second entry in the 'Serpent Riders' trilogy. It is set in the dark fantasy world of Silverspring. It runs on a modified Doom engine.
Wolfenstein (2009) is a first-person shooter that adds a supernatural layer — the Veil — to id Tech 4. It lets players slow time, bypass obstacles, and kill shielded enemies. Raven Software built it using id’s engine technology. Development problems led to layoffs. The Veil is mechanically functional but narratively detached. It is a technical demonstration, not a unified experience.
Heretic (1994) is a first-person shooter developed by Raven Software. It is the first entry in the Serpent Riders trilogy and is set in the dark fantasy world of Silverspring. The game uses a modified Doom engine to deliver level-based combat, key-driven progression, and fantasy-themed interactivity.
Hexen II is a 1997 first-person shooter built on a modified Quake engine. It is the second sequel in the 'Serpent Riders' trilogy. It features action-adventure and action role-playing elements.
Quake 4 is a movement-first FPS built on Quake’s legacy, not its future.