Your arm elongates, into a massive, wet, suckered tentacle. As part of the spell-casting action and as an action on each of your turns you can perform a melee spell attack against a creature within 30 feet. On a hit you deal 4d8 bludgeoning damage and the target must make a Strength saving throw if it is Huge or smaller. On a failure, you may choose one of the following effects:

• The target is knocked prone.

• You disarm the target; you take one item or weapon the target is carrying or wielding (and that

  is not fastened, e.g. armour) and return it to your person.

  The tentacle also serves as a useful appendage that can be used like a grappling hook or rope at the DM’s discretion.