Coaxia

Centuries ago, a distant sun exploded, sending an outlying planet into space. Slowing in our solar system, Coaxia smashed into the moon then slid softly into the Earth’s atmosphere. As panic ensnared the world, all society crumbled. The collision joined the two planets like two magnetic balls, disrupting all known physics. Life, water, and air flow between the two planets. After more than 100 years chaos ensues with factions warring over resources and control.