Here the 1874 RLDS edition replaced souls with the singular soul, probably accidentally. The 1908 RLDS edition restored the correct plural. The plural is what we expect here, although the Book of Mormon does occasionally permit the singular soul in generically plural contexts, as discussed under Mosiah 2:20–21. Here in Mormon 8:33 the critical text will maintain the expected plural since it is the reading of the earliest text.
Summary: Maintain in Mormon 8:33 the plural souls in “that ye might bring damnation upon your souls”.