Song of Sadness
From Salazar’s Legend Lore:
Azklial’s Scepter gave the divine power to mate angels and devils
Azklial’s Scepter is fabled to be able to maintain control over celestials or fiends.
Those offspring, The Tainted, were born stricken with illness, and suffered a short and horrific life. Without the third element, they were doomed.
The Scepter has been locked away and under guard on the sixth plateau of Mount Celestia.