Strategist

Not only trained and involved in the fight, a strategist can also find the intelligence behind it. They use that knowledge to their advantage. Even though a strategist only sees what is on the surface, they use their experience and knowledge to figure out, consciously, what is going on. 

Observance

3rd level

Beginning when you choose this feature at the third level, you can add your Intelligence modifier to your armor class (the minimum bonus is +1).

Planning Ahead

3rd level

You and your allies gain an advantage on initiative if you spend at least 10 minutes scouting the area/opponent's numbers, planning, etc.

Experienced

7th level

You become half-proficient in all Intelligence checks, if you are not already. Additionally, you also become half-proficient in the Wisdom (Insight) check.

Enemy's Strategy

10th level

On your turn, you can use your action to attempt to figure out your opponent's strategy. You can do this only if the opponent can think for itself, or if it has an Intelligence score of 3 or higher, as well as if you can see most or all of your opponent(s). 

You can figure out your opponent's strategy by doing an Intelligence (Investigation) or Wisdom (Insight) check (Your choice), with a DC of 13. On a successful check, you gain the upper hand and have an advantage to attack rolls against the opponent. This bonus lasts for 10 rounds, or until your opponent's strategy changes. This can only be done once per short rest.

For each level afterwards that you get a new archetype feature, you can do it twice, and then three times per short rest.

Background Knowledge

15th level

You are able to make an Intelligence (Nature) check to recall information about the creatures you are fighting. On top of learning more about the creature, you also gain a +2 bonus to attack and damage rolls. This effect lasts the rest of the battle. 

Improved Reading

18th level

Your ability to figure out your opponent's strategy has improved with practice. Now, when you roll a successful check to figure out the enemy's strategy, your opponents have a disadvantage on attacks against you.

Additionally, when you hit an enemy with a melee attack, you learn its armor class and one of the following: vulnerabilities, resistances, or immunities (Can be a dice roll or at the DM's discreetion).