The Defender

He protecc

Furious Strikes

At 3rd level you learn how to put more strength into your attacks and make them harder to parry. As the part of strength weapon attack you can use this feature to gain bonus to hit and to damage equal to your Proficiency Bonus. This feature can be used number of times equal to your Constitution modifier. You regain all uses after short or long rest.

When a creature drops one of your allies to 0 hit points in your sight, you go into a blind rage and attempt to revenge them . As long as that creature is alive you gain bonus described above on all strength based attacks against that creature, and disadvantage on all attack rolls against any other target until the end of your upcoming turn. Moreover you can use Dash as a Bonus Action however you can use it only toward that creature. If many allies have been taken down by different creatures, the bonus overwrites disadvantage.

Perceptive and Attentive

At 7th level, you learned how to focus more on the way your enemies are moving, wielding their weapons and blocking with them. 

After you make a melee atack against the creature (whether it hits or doesn't) you can use a bonus action to shout about the weak spots you have noticed in your enemy. The next atack made against that creature by any of your allies that heard you has advantage until the start of that creature's next turn (as in their turn they can adapt their pose and given advice might not be applicable any more). 

Moreover you gain proficiency in Perception (or expertise if you already have proficiency) and you can't be surprised while you are conscious.

Encouraging Cry

When you use your Second Wind feature, you can choose number of creatures up to your proficiency bonus within 60 feet of you that are allied with you. Each one regains same amount of hit points as you, provided that the creature can see or hear you.

Perfectly Balanced

The first time you hit the enemy who had hit your ally in their last round, you get bonus to damage equal to your proficiency. 

When you are forced to do something harmful to your ally (by any mean of spell of effect that required failed saving throw) you can reroll that saving throw one time to try to resist the effect. Can be used number of times equal to your proficiency bonus, all uses are regain after long rest

Survivor

At 18th level, you attain the pinnacle of resilience in battle. At the start of each of your turns, you regain hit points equal to 5 + your Constitution modifier if you have no more than half of your hit points left. You don’t gain this benefit if you have 0 hit points.