eldritch focus

for every turn you focus do 1d8 times by the amount you concentrate,do not do damage until you finish the spell. it follows the pattern of eldritch blast. however, you do not need eldritch blast to perform this just imagine you did have it,you have to be at least level 5 because you need to imagine you have 2 or more eldritch blast beams, for every extra beam past 2 add 2d8. if you loose concentration take 1d20 force damage  rolled by the DM. when you finish concentrating  release all the damage you have prepared in a ball of radiant and force damage.