My Story Background Ideas.
Zerg: The Zerg have adapted to the ever increasing Terran threat by Integrating technology into their organic bodies, including armor, guns, rockets and, in special cases, Sheilds. They have evolved in an organic sense as well, they have stronger armor, melee's and move generally faster, of course these come with their disadvantages, some units are slower, weaker, and easier to kill.
Terran: The Terran have made many advances in production, protection, and elimination, but problems arise from these technological leaps, such as massive energy usage, weapon inaccuracy, and very high production costs.
Protoss: The Protoss having lost their homeworld and most of their population, have retreated to primal roots and are resorting to desparate measures. They have devolved quickly due to their dependance on technology, and have lost much of their ability to advance technologically, or to repair their current technologies. This has lead to inneffective weapons and slow reload times, along with slowed production times and warping effectiveness. The de-evoloution of the Protoss race has lead to reduced power consumption and more powerful, less complicated, melee weapons and Kenetic ,or 'Bullet', weapons.