Your character will turn invisible when he wears this Magic Cape. While hidden from the enemies' view, you can attack them without taking damage. Although the cape is a useful item, it will consume Magic Power while you are using it.
A Link to the Past & Four Swords instruction booklet
Cane of Byrna & Roc's Cape
Press the A Button to activate these magical items, and press the A Button again to deactivate them. If you run out of magical power while using one of these items, they will deactivate automatically.
The Cape can be found under one of the graves in the Graveyard north of Hyrule Castle. The only way Link can get into the cave is by performing a Dash Attack into the grave surrounded by dark colored rocks. The dark rocks can only be lifted using the Titan's Mitt, though the young hero can bypass them entirely by using the Magic Mirror to reach the inner part from the Dark World.
When wearing the Magic Cape, Link becomes invisible, being able to pass through enemies and spikes without receiving any damage. However, the cape requires a high amount of Magic Energy in order to be used. The Magic Cape is necessary to gain access to one Piece of Heart by walking through a bumper on Death Moutain.
Four Swords Adventures
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The following section is not part of the Zelda canon and should not be taken as such.
In The Wand of Gamelon, the Shroud and Magic Cape appear as related items. The Shroud is received from Lubonga of Aru Ainu, and is used to defeat Gibdo in a single shot. The Magic Cape is the upgraded form of the Shroud, which allows Zelda to jump higher and at longer distances at the cost of 5 Rubies per use. The Magic Cape is obtained by giving an Arpagos Feather to Myra in Hanyu Forest, which she uses to combine with the Shroud.
Another similarly named item, the Magic Cloak, also appears in The Wand of Gamelon. It functions similarly to the Magic Cape from A Link to the Past, as Zelda can wear it to temporarily become invisible and walk past enemies at the cost of 20 Rubies per use. It is the upgrade to the Cloak that Zelda receives from Lika in Sakado. She will offer to turn it into the Magic Cloak if Zelda brings her some Fairy Dust.
↑Encyclopedia, Dark Horse Books, pg. 130 (ALttPA Link to the Past | FSAFour Swords Adventures)
↑Magic Cape -- Assign to Using this will allow you to become invisible, consuming stamina and avoiding enemy attacks. Use it again to cancel the effect. — Inventory (Cadence of Hyrule)