Titanborn (5e Subrace)
From D&D Wiki
Titan aasimar are empowered by the colossal strength of a celestial titan — most often, an empyrean. They stand resolute against those that would do evil, though some, touched by a corrupted or cursed titan, may turn their ire toward the forces of good, seeking only to darken the light in the world.
Ability Score Increase. Your Strength score increases by 1.
Powerful Build. You count as one size larger when determining your carrying capacity and the weight you can push, drag, or lift.
Enlarge Form. Starting at 3rd level, you can use your action to double your size in all directions and multiply your weight by 8. This growth increases your size to Large. If there isn't enough room for you to double your size, you attain the maximum possible size in the space available. Your equipment also grows to match your new size. While enlarged, you have advantage on Strength saving throws and Strength ability checks, and you deal an extra 1d4 damage with your weapon attacks. You remain enlarged for 10 minutes. Once you use this ability, you can't use it again until you complete a long rest.