Zaapiel is described as a destructive angel in Geoffrey W. Dennis’s The Encyclopedia of Jewish Myth, Magic and Mysticism, second edition, 2016.
Souls and storms
The entry places Zaapiel in charge of utterly wicked souls in Gehenna. It also reports an identification with the angel of storms, citing III Enoch and BhM 5:186.
Source
“Zaapiel,” in the Z section, digital reproduction of Dennis’s encyclopedia on Publicism.