Transferance sphere

You cast a dimly lit sphere radiating 60ft in each direction of yourself. Your diety will grant you temporary control over the life essence of those within the sphere. Creatures you or your diety deem enemies must make a wisdom saving throw. On a fail saved take 1d8 necrotic damage and half as much damage on a successful throw.  All hitpoints taken from your enemies can be redistributed to any allies within the sphere, healing them for the equal amount of damage done. 

At higher levels, the damage done is increased by 1d8 for each slot above level 4.