Draining Thorns

You call forth vines from the ground around you, to drain your opponents of health and heal yourself and allies with it. Call forth vines to tangle on the ground 30 ft. around you. When you cast this spell, you must designate every creature in range of it as an opponent or ally:

• Opponent - If a creature is designated as an opponent, then they take 1d10 piercing damage from the thorns each turn they are in range of this spell for the spell's duration.
• Ally - If a creature is designated as an ally, then you must choose (an) opponent(s): the ally receives health equal to the opponent(s) that they are paired with.