Dean refers to the Impala affectionately as '"Baby." At the end of the series, it is unknown what became of the Impala although Sam might've left it to his son Dean Winchester II. The Impala, featuring its original license plates, also exists in Heaven at the same time as Sam owns the Impala on Earth.

The Entity\n\n The Cosmic Entity might be the most powerful Supernatural monster in history, but there is not enough known about it to rank it very high on this list. The Entity predated God, the Darkness, and Death. However, the full power of the Entity is unknown, as we still don't know what its specific powers are yet.