Azol's Tactical Edge

You attempt to gain magical insight into another creature’s capabilities. When you cast this spell and as a Bonus Action on subsequent turns, you can force another creature you can see within range to make a Charisma saving throw. On a failure, you learn your choice of the following:

• The target's maximum Hit Points, current Hit Points, Temporary Hit Points, or AC.
• One special sense the target has and any applicable notes or scores.
• One Resistance, Immunity, Vulnerability, or saving throw bonus or penalty.
• One Action, Bonus Action, or Reaction the target can take.
• One magical effect currently affecting or originating from the target or its equipment.

If your choice applies to multiple statistics you have not already learned, the GM (or player, if the target was a Player Character) chooses which to reveal, if any. If you learn no new statistic, the target instead suffers a -2 penalty to all Attack Rolls and Saving Throws until the start of your next turn.

At Higher Levels. The penalty increases by -1 for each spell slot level above 2.