Drow High Magic

Prerequisite: Elf (drow)
You learn more of the magic typical of dark elves.
You learn the Detect magic spell 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.