Wrath of the Kaiju, pg. 179
You are a master of grappling, able to use your size and strength to devastating effect in close-quarters combat. You gain the following benefits:
• Increase your Strength score by 1, to a maximum of 20.
• You have advantage on ability checks and saving throws to avoid being moved against your will or knocked prone.
• Creatures can’t have advantage on Athletics or Acrobatics checks to escape your grapples.
• Creatures grappled by you have disadvantage on ranged weapon attacks and spell attacks that require somatic components.
• When a creature within your reach provokes an opportunity attack from you, you can use your reaction to attempt to grapple the provoking creature