Deasatra's Mystic Chain Gang

As a part of the action of this spell you attempt to lock a creature within range in manacles, the targeted creature must make a Dexterity Saving Throw to avoid being locked up. If the creature succeeds, the spell fails. If the creature fails, the target becomes magically locked up becoming incapacitated and their movement reduced by half, then you may target an additional creature within 5 feet of the original target, at which point spectral copies of your manacles shoot out of the original and attempt to lock up the target who must make a Dexterity Saving Throw, getting locked up and similarly affected for the duration of the spell on a fail. If the spell succeeds on capturing an additional target, you may repeat the effect on another target within 5 feet of the second creature, you may only chain this effect 2 times after the first, for a total of 4 affected creatures. The creatures are all chained in tandem to each other and cannot move farther than 5 feet away from the creature they are directly attached to.

At Higher Levels: When you cast this spell using a spell slot of 4th level or higher, you can chain the spell one additional time for each slot above 3rd.