Shared Frenzy 2014

You yell defiantly as part of casting this spell to encourage a battle fury among your allies. Each friendly creature in range must make a Charisma saving throw; a creature can choose to fail this saving throw if it wishes. If a creature fails its saving throw, it has resistance to bludgeoning, piercing, and slashing damage and has advantage on attack rolls for the duration. However, attack rolls made against an affected creature have advantage.

When you cast this spell using a spell slot of 4th level or higher, this spell no longer causes creatures to have advantage against the spell's targets.