Dark Reach (5e Spell)
From D&D Wiki
|Casting time:||1 action|
|Duration:||Concentration, up to 1 minute|
One creature of your choice that you can see within range must make Strength saving throw as their shadow is essentially strapped down and immobilized, restricting their own movements. On a failed save, they are restrained for the duration of the spell. A creature restrained by this spell can use its action to make a Strength check against your spell save DC. On a success, it frees itself.
This spell does not affect creatures that do not cast shadows.