Echoes of War

You create a sword-shaped rip in time that hovers in front of the casters heart the sound of battle echoes from it. The sound grows in power the more you fight. It fuels your blade and sharpens your mind. It lasts for the duration.

For the duration you have advantage for Wisdom and Intelligence saving throws. 

Every time you hit an enemy after casting this spell roll 1d6+1 add this number to your total number of 'Charges of Echoes'. 

Once the number of 'Charges of Echoes' you have reaches or passes 10, this spell is triggered and all charges are consumed. Pick a target within 30ft. of you, they must make a Wisdom or Intelligence Saving Throw (your choice). The target takes 4d10 force damage and only half as much on a on a successful save. 

If your 'Charges of Echoes' were to ever reach 14 roll as normal and then double the force damage.

At higher Levels: When you use a 2nd level or higher spell slot to cst this spell you may also pick a target within 30ft of you and choose one ability when you cast the spell. The target has disadvantage on ability checks made with the chosen ability.