You affect a creature within casting distance that you can see with magic and imply some sort of action (in the form of a sentence or two at most) to it. The target of the spell designated by you must be able to hear and understand your words. A creature that cannot be charmed is also immune to this effect.
Suggestion 5e
Level: 2nd
Classes: Wizard, Bard, Sorcerer, Warlock
Casting Time: 1 Action
Range: 30 feet
Components: V, M
Duration: Concentration, up to 8 hours
Your implied words must be able to make their behavior sound logical. Asking a creature to stab itself, slam itself into the tip of a spear, make it self-sacrifice, or make it do anything obviously harmful directly cancels the effect produced by the spell.
The target must make one perceived immunity, and the immunity loser will do its best to engage in the behavior you describe. The behavior you implied may be performed at all times for the duration of the spell. And if the activity you implied can be completed in a shorter time, the spell will terminate as soon as the target has completed what you asked for.
You can also describe a specific situation that occurs during the duration as a condition for triggering a special action. For example, you could suggest that a group of soldiers give all their money to the first beggar they encounter. If the condition is never met before the spell ends, the specified act is not performed.
If you or any of your companions harm the recipient, the spell is then terminated.