Akbar's Light Kamikaze

You sacrifice your body and soul to turn into a mass that travels at the speed of light towards one direction. You can kill one creature in any direction that you can see along with yourself. Forcecage and other spells that could stop the user from moving don't work. However, if the person using the spell is hit with any spell that targets them or damages them, the spell fails. The user can only come back by a Wish spell after using this spell. Forbiddance would not work to stop the spell.