For the similar substance that can neutralize magic, see Sea Nymphs' Sand.
While searching for the Dark One Dagger to give to King Arthur in order to make Excalibur whole again, Guinevere and Lancelot arrive in the portion of the Vault of the Dark One where the dagger is being stored, kept safe by a protection spell. After they are knocked back by said spell, Rumplestiltskin appears and taunts them. Upon hearing why they want the dagger, he tells them that he cannot part with it, but offers the "next best thing": enchanted sand from the Isle of Avalon. Guinevere accepts, and plans to use the sand to make Excalibur appear whole so that Arthur will stop obsessing over the dagger. After sharing a tearful goodbye with Lancelot, she makes her way up to the tower, and while Arthur is distracted digging through her bag uncorks the bottle and begins to dump the sand out. However, she has a change of heart, and admits to Arthur her plan. He is upset with her, and when she threatens to leave him he snatches the sand and blows it on her, "fixing" their marriage. Upon seeing his success, Arthur takes the sand and blows it over the kingdom of Camelot itself. ("The Broken Kingdom")
After tricking Arthur with a fake dagger and discovering his true colors, Mary Margaret Blanchard, David Nolan, and Lancelot take him to Granny's Diner, which is crashed just outside of Camelot, tied up. However, as they threaten to reveal his secret and hand the kingdom to Guinevere, the king smirks, causing David to realize he knows something they don't. Just then, Guinevere arrives with some of the knights of Camelot, and as she frees Arthur, Lancelot realizes that Arthur used the sand on her and begs her to stop, as they can break the curse. She responds by telling him that she is uninterested and has him sent to the dungeon. When Mary Margaret and David tell Arthur that their friends will be suspicious if he arrests them and that they can still reveal his secret, Guinevere responds by saying that she thinks they will help. Arthur tells her to "fix this", and she blows the sand on them. Under the effects of the sand, they tell Regina Mills and Robin Hood that Arthur is perfectly trustworthy and that they need to give him the dagger. ("The Broken Kingdom")
Regina leads David and Mary Margaret to where she hid the dagger, but refuses to give it to them as she is still wary about trusting Arthur. As they are still being affected by the sand, Mary Margaret attempts to take the dagger by force, but Emma Swan appears and uses her dark magic to freeze her parents, having seen Guinevere blow the sand over them through a dreamcatcher. ("Dreamcatcher")
After Merlin is freed from the tree he was trapped in by a previous Dark One, he uses his magic to unfreeze David and Mary Margaret and wipe away the effects of the sand, reverting them to normal. ("Dreamcatcher")
|Once Upon a Time: Season Five|
|"The Dark Swan":||"The Price":||"Siege Perilous":||"The Broken Kingdom":||"Dreamcatcher":||"The Bear and the Bow":||"Nimue":||"Birth":||"The Bear King":||"Broken Heart":||"Swan Song":|
|"Souls of the Departed":||"Labor of Love":||"Devil's Due":||"The Brothers Jones":||"Our Decay":||"Her Handsome Hero":||"Ruby Slippers":||"Sisters":||"Firebird":||"Last Rites":||"Only You":||"An Untold Story":|
|Once Upon a Time: Specials|
|"Magic is Coming":||"The Price of Magic":||"Journey to Neverland":||"Wicked is Coming":||"Storybrooke Has Frozen Over":|
|"Secrets of Storybrooke":||"Dark Swan Rises":||"Evil Reigns Once More":||"The Final Battle Begins":|
Note: "Archive" denotes archive footage.