A Necromancer's Companion

In my headcanon my female necromancer created the first Sorrow creature. This is the first one that she created. At first it was only able to hold it's wisp form, as it consumed more emotions and energy it was able to hold a semi-corporeal form until it finally was able to keep a solid form. Once mature it could shift to any form and use its phantom like powers with ease. 

Lore:
Later when it got enough energy it was able split and form another sorrow. This is where all the sorrows originated from. A sorrow always starts out as a whisp and develops it's own personality as it grows and consumes emotions.