Whirlpool

You conjure a whirlpool of salt water at point you can see within range. It has a 20ft radius and is considered difficult terrain for any non aquatic or amphibious creatures. When a creature starts its turn within the whirlpool they must make a strength saving throw vs your spell save DC or be pulled 10ft towards the center of the whirlpool and are grappled until the start of their next turn. This can only effect creatures that are Large or smaller. If you cast this spell using a 5th level slot then you can effect creatures of huge or smaller, and can effect Gargantuan or smaller creatures using a 7th level spell slot.