Aura of healing

A wave of magenta energy swoops out from your feet onto the ground in a 20-foot-diameter cube centered on you, creating an aura of healing. Designate up to 10 creatures that you can see. While a designated creature is in the aura, it can use it's action to touch the ground, regaining hit points equal to 1d10 + your spellcasting ability modifier. Any undesignated creature who tries to heal using the aura takes 1d10 force damage and must succeed on a strength saving throw or be pushed back out of the aura