Dying Light

An arrow of necrotic energy pierces the heart of your fallen ally. When a friendly creature is knocked down you can use your reaction to instil life back into the creature.

The creature gains 3d10 temporary hit points + the spell casters modifier and have their max hit points reduced by the same amount.

If the creature is healed the creature cannot regain full hp until finishing a long rest.

If the caster loses concentration, the targeted creature drops back down to 0hp and has to make a death saving throw.