The Immortal is a File:Purity-Harmony.png Harmony - Purity hybrid melee unit that functions as a hard-hitting, early game alternative to Marines, like the Battlesuit. It requires 1 File:20xXenomassBE.png Xenomass to be built. Due to its high durability in comparison to Marines as well as ignoring terrain penalties, it excels at clearing Alien Nests, which can be bolstered further using an Architect (CivBE). When upgraded, it has a generic upgrade which allows it to heal 15HP when not embarked, which essentially renders them literally immortal in combat one-on-one.