Bertha

Bertha is a large woman and a former opera singer. She works as a contractor who can control sound resonance. By emitting a frequency that is the inverse of a target's resonance frequency, she can destroy the target.
This ability can also cause other physical issues, such as a heart attack, by matching the heart's resonance frequency.
Bertha's payment method involves placing an object in her mouth and then vomiting it out; for instance, she is shown paying by eating a handful of cigarettes and then spitting them up. The item does not have to be cigarettes, but she tells Itzhak about her past, recounting how she had a baby who unfortunately choked to death after ingesting one of Bertha's dropped cigarettes.
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