The Silver Elysia

50 years ago, earth air started to become unbreathable. As the earth was about to fall, humanity decided that they had no choice but to leave the earth. Humanity left behind them the botanists of the old civilisation to create a new plant able to survive in extreme conditions. 50 years later, after the botanists sended a signal to humanity, they sent the newly founded Silver Elysia, an organisation of the new civilisation botanists to explore the new land and find where the signal came from but something seems to roam around the surface. Something not made of flesh but leaves, something that does not welcome the Silver Elysia.