In the mural, three witches from the East sequentially jumped into the fire basin. The nascent flames of the Fire of Law successively melted their bodies, spirits, souls, and magic powers.
The three eastern witches died.
No, or rather, their essence and magical power forever merged into the continuous leaping and burning flames of the Thousand-Year Fire.
As long as the Thousand-Year Fire remained burning, their magic powers and spirits would never disappear.
Although they sacrificed their own lives and freedom, there's always a corresponding price and risk to be borne with magic - and vice versa.
The great extent of their sacrifice allowed their magical powers and spirits to remain intact, even after over two thousand years.