Solaris We didn't believe in angels until they invaded. One by one, the sunscrapers of Mercury fell. At Penumbra, we fight back. The wonders of our world are fading, but the stars shine brighter each night.

Although the solar invasion has been stopped at Mercury, the enemy is unassailable and no victory is in sight. Despite the vast amount of resources poured into Penumbra, some backers, particularly the nations of Jupiter, are starting to question the effectiveness of the Mercurian defense. Some question whether the defense needs to be on Mercury at all, others whisper that the planet is a lost cause.   The supporters of Penumbra are now staking their hopes on the arrival of the Sentinels. Famed defenders of the Solar System against the horrors of the Kuiper Belt and beyond. This will be the first time any have been assigned against internal threats. Their proven track record against supernatural entities, they say, will finally break the stalemate.