Perimeter: Emperor's Testament – a plot branch of the original game, which shows events developing in parallel to the previously shown story. The KD Lab company also worked on the project; they made a number of changes to the relative past of their brainchild. All changes are aimed at technical stability and improving the gameplay component. The graphics remained virtually unchanged, some textures were corrected, and some special effects were added for more colorful action scenes.

The gameplay remains classic for the real-time strategy genre. The user is entrusted with the management of his own territory and an initial set of units for the development of the base. It is necessary for extracting resources and building a powerful army, which includes a variety of futuristic combat units with powerful weapons and sufficient armor.

The setting for all the events of the “Perimeter” story campaign, designed for single playthrough, is a distant galaxy with fictional races and factions. Different states and associations are in conflict with each other – the Empire, the Spirits, the Return and the Blight. All of them are available for selection in multiplayer mode, which has undergone changes and received 3 new maps for battles between gamers.