Azmodium's Calculated Destruction

 As an action Choose 3 5ft squares within 60ft,on each of these a rune appears within that cube. Choose a elemental damage type on cast for each sigal. As a bonus action you can detonate a sigal as a point or blast explosion a point explosion does 6d6 in a 5ft square where as a blast deals 3d6 damage with a 5ft radius

 At higher levels an extra sigal can be placed for each spell level higher.