Alone 2014

You cause a creature within range to believe its allies have been banished to a different realm. The target must succeed on a Wisdom saving throw, or it treats its allies as if they were invisible and silenced. The affected creature cannot target, perceive, or otherwise interact with its allies for the duration of the spell. If one of its allies hits it with a melee attack, the affected creature can make another Wisdom saving throw. On a successful save, the spell ends.