essence burn

a spell that drains your life essence to unleash an explosive AOE force that upon contact will completely blip them from existence but once the spell is over you crumble into dust. If cast as a ritual with multiple casters it will distribute the strain so that the more people there are the more alive and healthy they will be once the spell ends. You can distribut the strain by either having several people be preforming the spell witch will spread the damage and lasting effect or you can use a magical artifact that you have filled with life essence. To do this you must use 5th level and beyond vampiric touch but it must have life essence equivalent to or greater than your life essence.