Veil of the Midnight Eclipse

By drawing forth the essence of cosmic shadows, you weave an inky veil that swathes a 30-foot radius area in stygian darkness. Within this area, all creatures must make a Dexterity saving throw. On a failed save, they suffer 6d8 necrotic damage and are shrouded in a veil of shadowy illusions, granting them half cover but imposing disadvantage on their attack rolls and perception checks that rely on sight. On a successful save, the targets take half damage and are unaffected by the shadowy illusions. The shadows remain, swirling and distorting light until dispelled, or until they are banished by a strong light source like daylight. This enigmatic phenomenon occasionally reveals glimpses of a strange, cosmic void within the swirls, causing affected creatures to momentarily forget any perception of time's passage, reflecting the caster's mastery over temporal and shadow magic alike.