Your "magic" is powerful enough to cast every "spell" that exists (and no one can prove otherwise without broken ribs). However, you only prepared the following "spells" today. While your XPHB is active, you can use each of the following "Spells" once. When you do so, you can't use that "Spell" again until you finish a Long Rest.
Burning Hands
Your backhand slap is legendary. As an action, you can make an Unarmed Strike against each creature within your reach. On a hit, this strike deals Bludgeoning damage equal to 1d8 plus your Strength modifier and the target has Disadvantage on the next attack it makes before the start of your next turn.
Magic Missile
As an action, you can make three ranged attacks using Darts, Daggers, or other weapons with Thrown that use Strength for the attack and damage rolls. Because Magic Missile never misses, you have Advantage on these attack rolls.
Shield
When you are hit by an attack roll, you can take a Reaction to quickly don a Shield to defend yourself. You gain the Shield's AC bonus against the triggering attack, potentially causing it to miss. If the attack hits, the damage dealt to you is reduced by an amount equal to your Barbarian level.