Your entity knows your allies are a necessary use for your path. 

You may choose any target ally in sight. Upon doing so, you reignite the *fist full of ashes* in a plume where you stand. The target ally (if willing) will swap places with you in an instant eldritch flash. Upon arriving in your allies position, you burst with eldritch energy, any creature within a 10ft. radius of you must make a DEX save DC 10 + your charisma modifier. Upon failure, they take 1d10 + charisma modifier of force / fire damage. Upon save, take half damage. 

An unwilling ally must succeed on a DC 14 + your Charisma modifier save. Upon success the spell is voided.