When her father was assassinated during an annexation war, it was the beginning of the end for the opposing forces. Mana, being the vengeful creature of justice she is assembled her men, marched for two weeks to the inland capitol of the offending country, and laid waste to it. The commands were to kill everything and burn it to the ground. They did exactly that, and consequently won the war.
Where the capitol once stood, it's rumored that you couldn't hear even a bird sing--for months.
Avery, having been a young resident (eleven years old) of the capitol when Mana and her men invaded recalls the event with a rather odd fondness.
"Before we saw her, we heard her. She sang the city a lullaby it would never wake from--a swansong. Horrified as I was, it was the most amazing thing I would ever see."