Changeling

Shapeshifter: you can change your size at will between tiny, small and medium, though your regular size is medium. Once after you have finished a long rest you can change your size to gargantuan for a limited duration. In that form, your Strength and Constitution each increase by 2, and your Dexterity is decreased by 2.   Nightkin: at night, sneak attacks and spells deal 1D4 additional poison damage.   Shapeshifting Arsenal: you are proficient with light armour, rapiers, crossbows and simple weapons. When in combat, you can instantaneously change your weapon into any other weapon for a limited duration. (i.e. you throw a dagger at an opponent, and just before impact you turn it into a warhammer to deal way more damage.)
 

Languages. You can speak, read and write Common, Undercommon and Elvish.