I saw that coming

Having studied many forms of fighting you are able to take a turn to observe a single foe and their style. On all subsequent rounds

For attacks from that foe

• Natural 20s are not critical
• Attacks against you are at a disadvantage
• If an attack misses you can take a reaction to counter attack
• Piercing bludgeoning or slashing attacks from non magical weapons do half damage

This can only be used on one foe at a time If that foe dies the player can then spend another turn to focus on a new foe

This can be used a number of times a day determined by your INT modifier (Min 1)