Time is more a suggestion that a physical law in the Feywild, and it does not occur to a fae to mark its age. They have no concept of childhood or adulthood. Fae do not die of old age, but simply 'when the moment arrives'. You are immune to magical ageing effects.

Crossing into the mundane world places the frustrating constraints of physiology and constancy on a fae's body. You select a preferred appearance (as per a human using the disguise self spell) before making the journey. Rather than mere illusion, this body is your true form until you return to the Feywild. While this selection can include exotic features such as wings, gills, or a tail, it cannot grant you practical benefits such as the ability to fly, breathe underwater, or improved balance.

Your height may be anything between 3 and 7 feet tall. Somehow, your chosen body weighs about 100 pounds, no matter how tall or broad you make it. Your size is small if you are under 4 feet tall, and medium otherwise.

Forced to rely on boorish principles such as light and sound, your senses are dulled while in the mundane world. You can see in dim light within 60 feet of you as if it were bright light, and in darkness as if it were dim light. You can't discern color in darkness, only shades of gray.

You are a visitor from a profoundly different plane. You can never have proficiency in the History or Religion skills. Whenever you make an Intelligence (History) or (Nature) check related to the Feywild or a being native to it, you are considered proficient in the respective skill and add double your proficiency bonus to the check, instead of your normal proficiency bonus.

Your creature type is fey, rather than humanoid. You are immune to the charmed condition, have advantage on saves against spells from the Enchantment school of magic, and magic can't put you to sleep.

You have vulnerability to damage from weapons made of cold-forged iron, you cannot harm a creature within a ring of salt, and you cannot pass through a gate or door shaded by a rowan tree or made of its wood. A humanoid suffering from psychosis automatically succeeds on checks to recognise your illusions, and anyone looking at you through an adder stone perceives your true form.

You don't require food or drink, but some fae enjoy delicacies like rusted nails in almond sauce, saltpetre champagne, and honey cakes with powdered glass of church windows.

Fae don't sleep. But while in the mundane world, they do find it necessary to spend 4 hours a day doing nothing more strenuous than reading, preening, lecturing their companions, or pulling the wings off dragonflies for later use. Whatever the chosen activity, it is far too absorbing to be able to stand watch at the same time. After resting in this way, you gain the same benefit that a human does from 8 hours of sleep.

You can cast detect magic and disguise self with this trait, using Charisma as your spellcasting ability for them. Once you cast either spell, you can't cast it again with this trait until you finish a short or long rest. The potency of fae glamours means you can seem anywhere between 3 and 7 feet tall whenever you cast disguise self.

As a bonus action, you can magically teleport up to 30 feet to an unoccupied space you can see. Once you use this trait, you can’t do so again until you finish a short or long rest.

You can speak, read, and write Common, Sylvan, and one other language of your choice.

Fae society is almost nothing like any on those found on the material plane, and little of a fae's peculiar skills or situational expertise translate usefully in the mundane world – save perhaps the impressive ability to thrive in a place so treacherous as the Feywild.

Rather than select a background, choose any one skill, one musical instrument (of your own invention, if you wish) which you add to your equipment, and choose a total of two tool proficiencies or one language from the sample backgrounds.

Your Charisma score increases by 2.