Agamemnons True Strike

You point a finger at a target in range. Your magic grants you a brief insight into the target's defenses. On your next turn, you gain advantage on your first attack roll against the target, provided that this spell hasn't ended. When you hit a creature with an attack affected by this spell. You can spend a bouns action making a Arcana, Investigation or history check depending on the monster type to reveal a resistance (DC 15) or a weakness (DC 18)