Tactician

As a tactician, you are an expert in observing your enemies an exploiting every weakness they present. To you, preparation is everything. Everyone around you is an open book and you use your wisdom and tactical knowledge to influence them to your and your allies' benefit. 

Exploit Weakness

You focus on a specific enemy on the battlefield to study their behavior, learn their weaknesses and gain benefits based on your tactical prowess. As a bonus action, you can roll a contested Wisdom (Insight) check versus the creatures' Charisma (Deception) check. On a success, you gain the following benefits:

• You have Advantage on all attack rolls against this creature.
• When this creature makes an attack roll against you, your AC for this attack increases by a number equal to your Wisdom modifier (minimum of +1).
• You have Advantage on all saving throws against this creature.
• You have Advantage on all Wisdom (Insight) checks you make against this creature.
• You can add your Wisdom modifier against all Charisma checks you make against this creature.

Your Exploit Weakness lasts for one minute, or until the creature is unconscious or dead. On top of the creature's turn, it can make a Charisma saving throw to undo the exploit (no action required). The save DC for this effect is 8 + your Proficiency Bonus + your Wisdom modifier.

You can use your Exploit Weakness a number of times equal to your Proficiency Bonus and you regain all uses after a long rest.

Masterful Insight

Your mastery of battle tactics enables you to enhance your abilities on the battlefield. You gain a number of Insight Dice (d8) equal to your proficiency bonus. You can use your Insight Die to gain the following benefits:

• Add your Insight Die to your attack roll or saving throw.
• Use the outcome of the roll of your Insight Die to reduce incoming damage.
• Add your Insight Die to your Wisdom checks.
• Add your Insight Die to your damage.

You regain your Insight Die after a short or long rest. You can only use one Insight Die once per turn.

Improved Exploit Weakness

Your gained experience grants you even more benefits to use on the battlefield. When reaching level 10, you can choose between the following additional benefits to your Exploit Weakness feature:

• Improved Critical: Your chance to land a critical hit on the exploited enemy increases: you now crit on a 19 or 20.
• Superior Tactics: You choose 2 Battle Master maneuvers. When your Exploit is active, you can use one Battle Master maneuver once per turn on the exploited enemy.
• Shared Insight: You grant one of your allies Advantage on all attack rolls against the exploited enemy. You can reassign this benefit to a new ally via a Bonus Action.

Improved Critical

Your chance to land a critical hit on the exploited enemy increases: you now crit on a 19 or 20.

Shared Insight

You grant one of your allies Advantage on all attack rolls against the exploited enemy. You can reassign this benefit to a new ally via a Bonus Action.

Superior Tactics

You choose 2 Battle Master maneuvers from the Battle Master subclass. When your Exploit is active, you can use one Battle Master maneuver once per turn on the exploited enemy.

Master Strategist

Before entering combat, you can use your Exploit Weakness feature to study the battle tactics of your enemy. You can use an Insight Die to add the roll to your Initiative. Additionally, when you succeed an Exploit Weakness check to study the battlefield before combat (Insight or Perception), your allies can choose to add the roll of your Insight Die to their Initiative as well.

Improved Insight Die

Your unmatched tactical prowess grants you even more benefits to use on the battlefield. Your Insight Dice increase to a d10. Additionally you can choose to spend an Insight Die on an ally within 15ft, instead on yourself. You can use this ability once per turn (no action required, but must be on your turn).