Slayer

In ages past, men were given the power to contend with those who's power was legendary. through the ages although many teachings of this art were lost, you remain. Your path is clear. Your sword is sharp and your will is unconquerable. You are a Slayer.

Slayer

At third level when you choose this subclass, you gain slayer points. Points are used to power your abilities. The amount of slayer points you have is determined by your fighter level. You regain these after a short or long rest.

When you deal weapon damage to an enemy within 120 feat of you, you can choose to spend a slayer point to steal a portion of their Armor Class, Saving Throws, Attack Rolls, or Spell DC from them(temporarily lowering it by one for each stolen until the end of your next turn) And adding it to the damage you deal with that weapon on each attack. This extra damage lasts until your next short or long rest. The damage can stack up to a maximum damage modifier of 1/2 your fighter level (minimum of +1). Once you reach your maximum modifier, you can no longer use slayer points in this way until the effect ends. 

Rebuking Smite

At 7th level as a reaction, You can attempt to redirect the Casting of a Spell that is within 30ft of you that you can see. By using an equal or greater amount of slayer points. If its spell level is less than or equal to the amount of slayer points you used, the spell is absorbed and has no effect on its target or target area. You can use this absorbed energy to empower your next attack.The next time you hit a creature with a weapon attack before the end of combat. The attack deals an extra 2d10 force or necrotic damage to the target.

When you reach 12th level, the extra damage increases to 3d10.
when you reach 16th level the extra damage increases to 4d10
when you reach 20th level the extra damage increases to 5d10

Once you use this ability twice you cant use it again until after a short or long rest

Legendary Surge

At tenth level You can spend a slayer point to use your action surge at the end of any turn as a reaction.

Additionally when a melee attack misses you, you can use your reaction and spend a slayer point to make an attack of opportunity against that opponent.

Ragnarok

At level fifteen when gaining a damage modifier--through the slayer feature-- from aberrations, undead, fiends, fey, or celestials, you can add +2 damage modifiers for every point spent up to your maximum damage modifier.

Improved Legendary Surge

At eighteenth level When you use your action surge when not on your turn you can move up to half your movement speed without taking opportunity attacks as well as take an action