Vahn's Venomous Bite

You summon a fey spirit that takes the shape of a 10ft long ethereal venomous snake at a point you see within range. Any creature that ends its turn within 5ft of the snake must make a Constitution saving throw or take 2d6 poison damage, or half as much on a successful one.

As a bonus action on our turn you may command the snake to move up to 30ft in any direction and either make a grapple attack or a bite attack against a target creature, using your spell attack. On a grapple success, target creature is either grappled until they use an action to escape (using your spell save DC). On a bite attack, target creature takes 1d6 poison and 1d6 acid damage and must make a Constitution saving throw or suffer the poisoned condition. When the snake moves, it can move through solid objects and over gaps, but it cannot end it's turn within an object or creature.

At higher levels: When you cast this spell using a spell slot of 3rd or higher, increase the poison damage from the bite attack by 1d6 for each spell slot above 2nd.