Gladiator

The Gladiator is an expert at fighting one enemy at a time. Challenging the strongest fighters on an enemy side to single combat. Confidence, capability, and the love of a good fight define a gladiator among the common rabble of warriors. Different gladiators approach their bouts in different ways. Some gladiators throw caution to the wind looking to hit their opponent harder and faster than their opponent. Others are the crafty and quick type, looking for opportune moments to go in for the finishing blow. While some hunker down with the ultimate defenses they can muster and slowly grind down their opponent in a grueling bout of attrition. The audience cheers equaling for them all, so long as they are the victor.

Challenge

When you adopt this archetype at 3rd level you gain the ability to issue a challenge to foes you deem worthy. Your attacks will be more deadly and as you level you will gain many abilities that affect your combat.

As a bonus action  you can challenge one creature within 60ft of you. While a creature is challenged you
deal an additional 1d4 damage to it with weapon attacks, this damage die increases at 7th,10th,18th levels. Once you have
challenged a creature, that creature remains challenged until one of the following conditions is met:

- The challenged creature is reduced to 0 hit points.
- The challenged creature verbally surrenders.
- You attack a non-challenged creature.
- You are reduced to 0 hit points.
- You finish a short or long rest.

At 3rd level you have one use of Challenge. Which you regain on short rest. You gain extra uses at 10th and 15th levels.
You regain a use of Challenge when one of the following condition is met:

- A creature you challenged is reduced to 0 hit points.
- A creature you challenged verbally surrenders.

Decisive Strike

Starting at 3rd level,  A gladiator learns to strike when the time is right, which is sometimes right away, with great precision to turn the tide of the fight.

Whenever you make a melee attack at a creature that you have challenged, you can have that attack be made at advantage. You can use this feature a number of times equal to your Strength Modifier plus your Dexterity Modifier with a minimum of 2 uses.  You regain all uses of this feature when you finish a long rest.

Retaliation

At 7th level, a gladiator has the ability to exchange blows with its opponent. An opponent is most distracted when they think they have the upper hand. When you are damaged by a 

 When you are damaged by a melee attack from a creature you have challenged, you can use a reaction to make a melee weapon attack against that creature.

Also at 7th level your challenge damage die increases to 1d6.

Carnage Spectacle

At 10th level, a gladiator can put on a deadly display for his audience, everyone loves a good execution.

Once per short rest when you reduce an enemy you have challenged to 0 hit points, you can use a reaction to have other creatures of your choice within 60ft of you gain advantage on saving throws until the end of their next turns.

Also at 10th level you gain an additional use of Challenge and your challenge die increases to 1d8.

Focused Fighting

At 15th level can now more easily avoid the blows of those unworthy to face him.

When you attack a creature you have challenged, any attacks made at you from creatures not challenged by you are made at disadvantage until the start of your next turn.

Also at 15th level, you gain an additional use of Challenge.

Bloody Glory

At 18th level, the gladiator can bathe in the blood of its enemies to fuel its fighting spirit.

Whenever you reduce a creature you have challenged to 0 hit points you regain hit points equal to 10 times your CON modifier.

Also at 18th level, your challenge damage die increases to 1d10.