Prerequisite: Elf (Drow)
As per this dnd 5e drow high magic feat, you can learn much more of the magic typical of dark elves.
You can learn the Detect magic spell and even able to cast it at will, but without expending the spell slot. You can also learn the Levitate and also the Dispel Magic, each of them which you are capable to cast once without even expending a spell slot. However you can regain the ability to cast those two spells in this type of way whenever you finish a long rest. The charisma is your spellcasting ability for all three.