Daggercaster mage

You might have been a soldier or an assassin who used daggers, and whether through a near death experience or intense emotion, your daggers awakened the magic within you. 

Chosen of the blade

you gain the ability to wield daggers in both hands and still cast spells with somatic components, and you can use your daggers as your spell casting focus . Additionally, you can use your cha instead of dex or str when using daggers.

When your daggers are thrown, they return to you, whether they hit or miss, but you can only throw the same dagger once more this turn.

Your daggers get a +1 bonus to attacks and damage rolls and count as magical for the point of overcoming resistances.  This bonus increases to +2 at 14 and +3 at 20

Extra Attack

At level 6, when you take the attack action, you attack twice instead of once. 

Absorbing dagger

Whenever you cast a sorcerer spell the next attack you make with a dagger deals an additional amount of damage. This damage is equal to an amount of d4s equal to the level of the triggering spell(cantrips are level zero)+any number of sorcery points spent+1. The damage is of the type of the triggering spell.

 

Elite Blade Casting

You can use your action to imbue a dagger with a spell. As part of this action, Throw the dagger, and cast the spell you choose as if it was originating from the target of the daggers attack