Mega Body

You have advantage on saving throws to resist diseases and the poisoned condition.

You gain resistance to poison damage. Once per long rest, when you fail a saving throw to resist a disease or the poisoned condition, you can treat it as a success instead

Instead of once per long rest, you can now use Big Healthy Body's feature a number of times equal to your proficiency bonus between long rests.

You gain immunity to diseases, poison damage, and the poisoned condition. You can now ALSO use Bigger Healthier Body's feature for any failed Constitution saving throws (that was not made to resist a disease or the Poisoned condition) as a Reaction