Knee-Jerk (5e Spell)
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You point at a creature within range that you can see clearly, sending whispered harassment to its mind. The creature visually becomes uncomfortable and is forced it to experience a slight muscle spasm, the nature of which depends on its environment. It must make a Wisdom saving throw, suffering a -2 penalty to Dexterity checks and saving throws for one minute on a failure.
You can not compel any specific actions, nor can the spasm cause damage if it strikes another creature. When applied during combat, this spell can only be cast as a reaction to an attempted Dexterity check or Dexterity Save.