Drow High Magic (UA: Feats for Races)

Prerequisite: Elf (drow)
You learn more of the spells typical for your people. You learn detect magic and can cast it at will, without expending a spell slot. You also learn levitate and dispel magic, each of which you can cast once without expending a spell slot. You regain the ability to cast the spell in this way when you finish a long rest. Charisma is your spellcasting ability for these spells.