This special attack move will have the following features, replacing the vanilla features:

1. A grapple may be used instead of an attack requiring one action and requires a check of Strength (Acrobatics) vs the creature's Strength (Acrobatics) or Dexterity (Athletics) whichever is greater.

2. Any subsequent attacks by the grappler are done with advantage and critical hits are extended to one more on the roll.

3. If an attack to the grappled creature is a critical miss, the grappler takes the hit. 

4. Area of affect spells also affect the grappler.

If the creature is additionally no more than 1 size larger:

5. The grappled creature is immobilized.

6. Any subsequent attacks by the grappled creature are done with disadvantage.

7. The grappled creature cannot cast spells requiring somatic gestures.

8. The grappled creature cannot change weapons other than natural weapons.