This expansion of the Battle Mages will add 4 new campaigns (including an undead campaign), an improved inventory system, new magical abilities, and also some new hero characters for each campaign, along with other new features, such as a new race dwarves.

One another new feature of the game is that the upgraded units can now be transferred throughout the campaigns. Hence, now gamers can build them up to be the ultimate units, just in time for the climactic last battle.

The graphics engine of Battle Mages has also been improved, so there are now day and night battles with real-time changing weather conditions also. In the game there are even new items and artifacts, and the troops now have inventory slots too.

It is said that each of the 16 maps is up to 3 hours long and that there are dozens of dynamic quests and optional tasks in this expansion of the game. Battle Mages: Sign of Darkness will be shipped for the PC this year itself.