Rodocer

Rodocer, Gemnar, or CelWP M9 is a red supergiant with two planets. The system is home to a habitable moon with an ecosystem using molten aluminum as a solvent (it's bloody hot).

History
The Rodocer system formed a few hundred million years ago, as a large B5 V star. It spent most of its life like this, with an extensive planetary system, perhaps even including a habitable planet! However, as Rodocer left the main sequence, it swallowed most of the planets, leaving only the outer two planets, and even those were drastically changed. Lovar was heated so much that it lost most of its mass and atmosphere, and Belerofis' moons were heated, one of them, Ronar, gaining molten aluminum oceans. The extreme heat caused rapid evolution for the creatures there, leading to them gaining intelligence before their environment became uninhabitable to them. Shortly after their space age begun, they noticed another intelligent civilization in the nearby Acra system, and kept sending messages. However, they needn't have done so, as there was a convenient wormhole orbiting around Belerofis near their planet leading to the Cracca system. They have since found good relations with the native Proxans, and are sharing technology and plan to starlift Rodocer down to a sensible size.

Fuuuuture...
However, if the starlifting plan fails, the star will puff out a planetary nebula (a very large one), and shrink down to a high-mass white dwarf. Slowly, this will cool to a black dwarf and be boring until the end of time.

Properties
Rodocer is a huge star, the largest in the Celestia Worldbuilding Project. It is 9.4 AU across, which is close to the orbit of Saturn, and slightly larger than UY Scuti. It has vast flares, sometimes reaching the equivalent of beyond the orbit of Neptune.