They told me…

While you're in a conversation with somebody you get to cast the spell by saying they told me and add the lie/command behind it. The command or lie should be simple enough to be actually believable. When casting the spell they make a wisdom saving throw equal to your spell save DC. If they fail they believe the lie or follow the command. If they pass nothing happens and they are really confused about what you said they told me. Only one target can be affected by this spell at a time.

At higher levels: at level 5, 11, 17 there is one additional target that can be affected by the spell.