It starts with a soul. The soul is the incorporeal essence of a being. When detached and collected, it resembles a spherical fireball but can also shape the being it belongs to.
Souls usually have a light blue color.
If the soul belongs to a heroic or exceptionally good being, it can appear more vibrant and vivid - if they have an evil nature, it can appear dull and smutty.
When they become Theristis, the color will change into a new color. This is also the color their soul fire will have.
A corrupted Theristis' soul will become black and inky.
When they become Theristis, the color will change into a new color. This is also the color their soul fire will have.
A corrupted Theristis' soul will become black and inky.