thorn bush

You create a bush of thorns anywhere within 60ft of each any character that starts its turn in the bush take 2d8 damage piercing damage

as a action you can make the bush wither and regrow anywhere within 60ft of you an amount of time equal to your proficiency bonus

when you start your turn in the bush you must succeed a DC strength saving throw

the bush is 5ft in diameter 

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher the damage increases by 1d8