Chonk (5e Feat)
From D&D Wiki
Prerequisites: BMI of 30 or greater
You are one chonky boy. You gain 50 pounds. If you have natural armor, your armor gives you an additional +6 AC bonus. If you are a feline race, it is a +9 AC bonus. Your walking speed decreases by 10, and if your speed is already below 10, your speed becomes 5 feet.