Blood bomb (revised)

You prick your plam and extend you arm and hand out toward creature(s)/spaces that you can see. A small droplet of your blood concentrated with magical energy potential launches from your hand and sail through the air until it it contacted by a corporeal material which then it will expand violently in a bloody explosion. The explosion size is 15ft from the point of contact and deals 2d20+10 with the addition of your spell cast modifier.