Of course, some enemy spellcasters and other magical creatures are able to cast spells as well, and of course, one of these spells can be a Suggestion! If you fail your wisdom saving throw, then your character is under the effect of Suggestion, unless they are immune to charm. Then the wizard will be able to give you a Suggestion. Now, chances are this Suggestion won’t be to murder your entire party, as this is considered an unreasonable order. Still, you might be suggested to go somewhere and do something away from the battlefield. Additionally, if this is a social encounter, you might be removed from the encounter or forced to do something detrimental (but not harmful) to the party.