The shrinking spell can decrease the size of people and objects to microscopic scale. The spell envelopes the targets in a bright pink light while they are being shrunk. It lasts for 8 normal hours but the spell recipients experience a much longer time.

For instance, when Leonard Powers casts the shrinking spell on Mark Lilly, Francis Grimes and himself to go inside the body of Twayne Boneraper to chase down Jerry McMillan, they go through the spell duration as 8 "Twayne days".