Polyhistor

Prerequisite: Martial Studies feat or Savant class, proficient in Culture, character level 7th; must have contacts with a college, university, or military academy.

Features

Hit Dice: 1d10 per polyhistor level.
Hit Points: 1d10 (or 6) + your Constitution modifier per polyhistor level.

Studied Proficiency (1st level). You are proficient in all weapons. For your Martial Studies feat, you can prepare two techniques after you complete a long rest , but one must be either experimental strike or committee defense.

Combat Focus (1st level). At the end of your turn, if in the past round you took a hostile action against a foe, a foe took hostile action against you, or you witnessed a foe taking or receiving hostile action, you gain 1 focus, to a maximum of five. Whenever five minutes pass without you gaining any focus, your focus resets to however many levels you have in this prestige class (1, 2, or 3).

You can use focus to temporarily access combat feats and gain other benefits.

Adaptive Style (1st level). You have learned a diverse set of fighting styles, and while you are master of none, as you gain insight into a battle you can discern moments where such techniques could be useful.

During your turn, you can spend 1 focus to gain the benefits of a combat feat. You must meet any prerequisites, and the feat must provide some benefit during combat and not provide an ability score increase. Whether a feat qualifies is at the Narrator’s discretion.

(If you’re playing Level Up, consider that you can use this ability to temporarily acquire new combat maneuvers via the feat Martial Scholar.)

You can gain access to up to two bonus feats this way at a time, which last until the end of combat, to a maximum of five minutes.

Inner Defenses (2nd level). You have devised techniques to recognize mental threats and divert them. Whenever you need to make a saving throw , you can spend 1 focus to become proficient in that type of save until the end of the combat (to a maximum of five minutes).

Perfect Aim (2nd level). If you have advantage on an attack roll and you hit with both attack rolls , you can spend 2 focus to treat the attack as a critical hit.

Cunning Defense (3rd level). You can anticipate your enemy’s moves, plotting out strikes, parries, and ripostes like gambits on a chessboard. You can modify your AC with your proficiency bonus instead of your Dexterity.

Masterstroke (3rd level). It is mentally exhausting, but you can use your considerable intellect to compose the perfect attack amidst the seeming randomness of battle. As an action, you can study the battlefield. Then until the end of your next turn you have advantage on all attack rolls, and if the unmodified die roll of an attack you make is 12 or lower, treat it as if you had rolled a natural 13. Additionally until the end of your next turn, your polyhistor abilities do not cost focus to use.

After you use this ability, you cannot use it again until you finish a short or long rest .