Bauman didn't know what she had been singing at all, even she didn't know why she had the thought to sing at that moment.
Her hands and feet had long been frozen stiff by the frigid wind of the Demon World at night, as was her face. Bauman even thought at one point that she didn't have the strength to open her mouth, but when she sat down with reckless abandon, it seemed even more suffocating in her chest, forcing her to take in large gulps of icy air to ease it slightly.
The piercing cold air rushed into her throat, and after making a round inside her slender and fragile lungs, it inexplicably transformed into closely linked notes, leaping out of Bauman's lips.
That was not any negative curse that a Lich would be good at, Bauman didn't even know what she was singing. She was merely keeping time with the entire forest, looking at the swaying branches casting dancing shadows on the ground, she took deep breaths with the rise and fall of her chest, and sang out weird melodies.