Illustrate a reverent and devotional image that depicts 'The Plague of Darkness,' as described in Exodus 10:21-29. Include the major elements of the scene: the enveloping darkness, the reactions of the people, and a sense of looming divine power. Apply a symbolic and mystical interpretation consistent with the tone of religious narratives. The style should incorporate bright and contrasting colors, intricate details, and a lack of text or words. The design should be consistent with pre-1912 art movements which are characterized by rich symbolism, like late Symbolist or Pre-Raphaelite aesthetics, and should resonate with the solemnity and awe often associated with religious art. The medium should mimic oil painting techniques commonly used in these art movements.