They brought a significant amount of new options to the gameplay, and they were cheap. These were two well received (micro)expansions.
They also included the “relations” panel in this expansion, an important feature that lets you know how good your relations with the other empires are, and why. Diplomacy brought a new tech tree specifically designed from scratch for diplomatic actions like missions that you can request from rivals or friends. Diplomatic features are a very important aspect of 4X games and knowing that Stardock decided to overhaul Sins diplomacy system with this new micro-expansion (again sold for $10). In early 2010 Stardock and Ironclad released Sins’ second expansion called Diplomacy. These new defensive features were well received because they relieved the player a bit from frenetic and repetitive defensive tasks, allowing them to focus more on other things. Labeled as a micro-expansion (that you could get for $10) it brought new defensive options, including formidable starbases and mine fields, among other things. In late 2008 the same team released Sins’ first expansion called Entrenchment. Sins of a Solar Empire: Rebellion is the third expansion to the well known Stardock and Ironclad RTS/4X space game Sins of a Solar Empire, that was released in early 2008.
