A standalone expansion to Planetary Annihilation.
The galactic war between ancient robot factions kicks into high gear with 21 new game-changing combat units, including five IMMENSE Titan-class units! Conquer new worlds and craft new strategies to take advantage of all-new multi-level terrains! Lead thousands of units in interplanetary campaigns across land, sea, air, and space! Destroy entire planets in your quest to dominate the galaxy!
Source: The Developer Website.