Prerequisite: Elf (drow)
As per this dnd 5e feat you can learn much more of the magic typical of the dark elves. You can also learn the detect magic spell and also can cast it at will, but without an expending the spell slot, even you can also learn to levitate and also the dispel magic, but each of those which you are able to cast once without simply expending a spell slot.
You are also regain an ability for being cast the spell in this specific way you may also finish the long rest. The Charisma is your spellcasting ability for these types of spells.
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