Warrior Poet

Not to be mistaken for a bard, this barbarian rallies their allies through war-cries and controlled fury.  Unlike most barbarians, this subclass takes a slower approach to issues; but that does NOT mean you wanna be on this guy's bad side.  These calloused hands aren't from creative writing.  This subclass allows you to use bard spells up to 5th level, using Strength instead of Charisma.  Spell slots open up with standard bard leveling.

Rallying Rage

Starting at 3rd level, whenever this barbarian rages, friendly creatures within 10 ft get +2 to their AC.

 

Leave My Friends Alone!

Starting at 6th level; and only twice per short rest, you can use a reaction to cancel an enemy melee attacking one of your allies within 50 ft of you.  This reaction has you shout at the attacking creature, forcing them to make a DC 12 CON check or have their attack canceled.

Take Notes

Starting at 10th level; and only once per long rest, on the turn after this barbarian has landed an attack on a creature; you can use your next action to make a note of the creature's weak-points.  For the next day you will have advantage on all melee attacks against this species of creature.  

Give Your All

Starting at 14th level; and only twice per long rest, you can choose an ally within 30 ft, the next action they make is an automatic success; but they still have to roll a dice.  For every number below 20 they roll, you take 1d6 psychic damage.