Warlock Punch

You channel into your hands strength beyond measure. This dark energy surrounds you, anchoring you into the ground, as the air crackles around you. From this you unleash a powerful strike against a creature. When you first use your action to charge this attack, your move speed lowers to 0, you gain resistance to all damage, and you cannot be moved by any means. On your next turn you may choose a direction with which to launch forward the stored energy as an action.

In a 10ft. line from the direction you chose make a melee spell attack. On hit you deal 6d12 force damage, any hit creatures are knocked back 20ft. and stunned until the end of their next turn. Immediately after you unleash this attack you lose all additional effects granted by this spell. During the time when you are channeling this spell, every instance of damage you take increases the attacks damage by an amount equal to your Spell casting modifier, to a Maximum equal to 5 x The Spell slot expended.

At Higher Levels. When you cast this spell with a spell slot of 5th or higher the damage increases by 1d12 per spell slot higher than 4th.