XenWar is a free online card game, where you can fight other players around the world. The game takes place in the far future, where mankind has founded a new energy source, called Xen. With the discovery of this new energy source, the world will change beyond our imagination. As a result of the energy source's influence, a new species of life will emerge: the Xenomorph. This new life form will be a direct result of human intervention, and as a result of the energy source's influence, mankind will no longer be the only dominant species on the planet. This new species of life will have its own unique characteristics and properties.

The game's main objective is to secure a Xen deposit.