Alien Armoury Expanded for OpenXcom is a free mod designed to enhance gameplay by introducing new alien weapons while retaining the core mechanics of the original game. Building upon the Item Levels mod, this expansion allows players to encounter aliens wielding advanced weaponry throughout various stages of the game. Notable additions include the Plasma Sniper Rifle, which boasts superior accuracy and power, and the Plasma Blaster, a hand-held light plasma cannon capable of area damage.

Players can research and utilize these new weapons, integrating them seamlessly into their strategies. However, it's important to note that this mod is incompatible with the Item Levels mod and Solar's New UFOs mod. The developer encourages feedback for new alien weapon ideas, aiming to balance the gameplay without overwhelming players with excessive options.