Sins of a Solar Empire: Entrenchment — the races have reached a stalemate and are consolidating their territories to prepare for the long term. This addition includes many improvements to existing protections and completely new ones. And also the main feature is the star base. Defense research trees now offer upgrades for hangars, defense platforms, etc. In addition, each race can now obtain mines. The defense tree also contains improvements for the starbase, as well as improvements for tactical structures. TEC uses a creatively named security tree for its updates. The Advent tree of protection is a tree of security, and the Vasaris rely on the tree of fortifications to bolster their defenses.