"Cosmic Connection"

You summon the power of the stars and emit a healing aura in a 15ft radius around you. When casting this spell, you roll 3d4 temp hp and give each creature, of your choice, within the radius that amount of temp hp. This spell cost an action to use, and then on every one of your subsequent turns you can use a bonus action or action to reroll the temp hp and regive it to the creatures of your choice (if the new amount you roll is lower than the current temp a creature has they can choose to keep the higher number). This last until you fail to resend the temp hp, you are hit and lose concentration, or you become incapacitated. 

For every 2 levels above four you cast this spell at, it gains 1d4 temp hp and another 5ft in the radius. Ex. lvl 6 - 4d4, 20ft ; lvl 8 - 5d4, 25ft.