In the "Sword coast adventurer´s guide" WOTC book the half-drows have the usual half-elf features but with some differences
- Half-elf (Drow descent)
Ability Scores: Cha +2; Choose any other two unique +1
Size: Medium
Speed: 30 ft.
Age. Half-elves mature at the same rate humans do and reach adulthood around the age of 20. They live much longer than humans, however, often exceeding 180 years.
Alignment. Half-elves share the chaotic bent of their elven heritage. They value both personal freedom and creative expression, demonstrating neither love of leaders nor desire for followers. They chafe at rules, resent others' demands, and sometimes prove unreliable, or at least unpredictable.
Size. Half-elves are about the same size as humans, ranging from 5 to 6 feet tall. Your size is Medium.
Darkvision. Thanks to your elf blood, you have superior vision in dark and dim conditions. You can see in dim light within 60 feet of you as if it were bright light, and in darkness as if it were dim light. You can't discern color in darkness, only shades of gray.
Fey Ancestry. You have advantage on saving throws against being charmed, and magic can't put you to sleep.
Variant Feature (Choose 1)
Skill Versatility. You gain proficiency in two skills of your choice.
Keen Senses. You have proficiency in the Perception skill.
Drow Magic. You know the dancing lights cantrip. When you reach 3rd level, you can cast the faerie fire spell once per day; you must finish a long rest in order to cast the spell again using this trait. When you reach 5th level, you can also cast the darkness spell once per day; you must finish a long rest in order to cast the spell again using this trait. Charisma is your spellcasting ability for these spells.
Languages. You can speak, read, and write Common, Elvish, and one extra language of your choice.
[Sc: SCAG, p116]
If they use the PnP Half-drow they have no differences in stats. You can choose to forfeit the extra skill proficiencies and get one proficiency ( Yeah, I know
) or get some racial spells (one use per long rest). that may useful for some builds but IMHO does not give any particular advantages for warlocks specifically in comparison with vanilla half-elves, albeit it´s cool to have drow magic for free but you may want the skills instead depending on your party, considering that warlocks only get 2 trained skills (and they do not have any of the universally useful perception and medicine, or even sneak, acrobatics, etc for example)
Right now we do not know the official features of the half-drow ingame.
