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The fourth key of Basil.

This emblem illustrates the Fourth Key. In the center, a human skeleton stands on a stone sarcophagus draped with cloth. To the left is a single tall candle with a glowing halo. To the right is a leafless tree stump. This imagery relates to the alchemical stage of putrefaction decay or blackening, where the material "dies" to be reborn in a purified state. The background shows a town by the water and a church-like building with a spire, contrasting the theme of death with the enduring life of the community and the spirit.