Eternal War: Shadows of Light is a Christian-themed first/third-person shooter running on a modified Quake engine. Eternal War expands upon the gameplay formula of Quake by introducing additional features and playing modes. Mike's journey spans 17 levels, which can be completed either in single-player mode or in co-op with other players. There is also another game mode called Flood, which involves fending off waves of demons and sealing the gates through which they come. This is primarily a multiplayer mode, but it can also be played with friendly bots. The game's setting has strong medieval fantasy motives. The eight weapons at the player's disposal either come from a medieval arsenal (dagger, crossbow, sword) or are various holy spells like Smite and Trinity Blast which are powered by manna. Essentially, most weapons function similarly to those of Quake. However, each also has an alternate firing mode that can be toggled at any time. Alternate attacks deal more damage at the cost of increased ammo consumption. The monsters also have medieval fantasy designs, sometimes reminiscent of Heretic or Hexen. These include zombies, levitating necromancers and various humanoid fighters in medieval attire. Many of the enemies have special abilities and alternate attacks, making them even more dangerous. One special feature unique to Eternal War is the player's ability to pray, which allows Mike to regain full health. It is not possible to fight while praying, but the player is surrounded by an aura that will banish any demons that might try to attack him.