Shards of Darkness
Ability Score Increase. Your Dexterity score increases by 2.
Age. A halfling reaches adulthood at the age of 20 and generally lives into the middle of his or her second century.
Size. Halflings average about 3 feet tall and weigh about 40 pounds. Your size is Small.
Speed. Your base walking speed is 25 feet.
Lucky. When you roll a 1 on an attack roll, ability check, or saving throw, you can reroll the die and must use the new roll.
Brave. You have advantage on saving throws against being frightened.
Halfling Nimbleness. You can move through the space of any creature that is of a size larger than yours.
Languages. You can speak, read, and write Common and Halfling
Halflings of Waterdeep
In the city of Waterdeep Halflings appear to be human children for most of their lives. Many live as orphans, or as beggars. The existence for Halflings is a desperate one since application of labor laws preventing children from work in factories.
Ability Score Increase. Your Charisma score increases by 1.
Naturally Stealthy. You can attempt to hide even when you are obscured only by a creature that is at least one size larger than you.
Other subraces of halfling exist, and if you purchase a copy of the PHB you are free to run one. You will need to build a background that explains your presence in the city of Waterdeep, but since halflings can easily be mistaken for human children even outside The Veil it should not be difficult to secure transport to the city aboard a trade ship or scout caravan.