Claire's Rusalka

You create an ethereal Rusalka to enchant and seduce your foes.

Choose a humanoid target within range. A glimmer of light lazily circles their head, drawing their attention. The target must succeed on a Wisdom save, or be Charmed by the glimmer, which takes the form of a beautiful Rusalka that only the target can see. At the end of each of the target's turns, it may make another Wisdom save; this save is made at advantage if the target has taken any damage since the end of its last turn, but it is made at disadvantage if the target is standing in water.

While charmed by the glimmer, the target is incapacitated, its speed is halved, and it must use all of its movement on its turn to move away from you, lured by the Rusalka. If there is a pond, or larger body of water within 30 feet, they will be lead towards that instead. Upon being led 30 feet away, either the Rusalka will attempt to keep them distracted and enthralled, or if the target is standing in water, attempt to drown them. If the target is being drowned, they immediately run out of breath and begin to choke, suffocating after a number of turns equal to its CON modifier. Otherwise, the target is simply Charmed and Incapacitated for the remaining duration of the spell and may not move as an action, nor may it make any further saves. 

At higher levels: If you cast this spell using a 4th-level spell slot or above, you may create one extra glimmer (and select one extra target) for each level above 3rd.