Sins of a Solar Empire: Entrenchment challenges you to defend your territory with massive starbases, platforms bristling with weapons, armor and shields capable of defending an entire planet. The expansions delivers, as I already said, new features, including: mine fields, new and more challenging AI, assault cruisers and new, improved visuals. If you’re a fan of the original game, then certainly Sins of a Solar Empire: Entrenchment is an expansion you should consider purchasing.