Fey Ancestry. The drow guard has advantage on saving throws against being charmed, and magic can't put the drow guard to sleep.
Sunlight Sensitivity. While in sunlight, the drow guard has disadvantage on attack rolls, as well as on Wisdom (Perception) checks that rely on sight.
Innate Spellcasting. The drow guard's innate spellcasting ability is Charisma (spell save DC 10). The drow guard can innately cast the following spells, requiring no material components:
At will: dancing lights
1/day each: darkness, faerie fire, levitate (self only)
Spear. Melee or Ranged Weapon Attack: +3 to hit, reach 5 ft. or range 20/60 ft., one target. Hit:4 (1d6 + 1) piercing damage, or 5 (1d8 + 1) piercing damage if used with two hands to make a melee attack.