Macey was a mace made of Gronckle Iron that Tuffnut found and named in Smoke Gets in Your Eyes. Tuffnut cherishes Macey a lot and has a weird habit of speaking to it. Macey later appeared in Dragons: Race to the Edge several times before it was destroyed during a battle against Dragon Hunters in Twintuition.
Macey is a shiny mace made of Gronckle Iron. Like most maces, it is covered with spikes and has a long handle.
Tuffnut found Macey on Trader Johann's boat and instantly loved it. That night, Smothering Smokebreaths, introduced to Berk by Dagur, stole Macey. When Tuffnut woke up, he was heartbroken and accused Ruffnut of stealing her. He then showed Hiccup and Astrid Macey's favorite spot; a cabinet decorated with flowers and leaves. He recounted that Macey loved watching the sunset, or the wall depending on where he placed her. In the end, Tuffnut was reunited with Macey after defeating the Berserkers and sending the Smothering Smokebreaths back to Breakneck Bog.
When Tuff thought he was turning into a dragon, he gave his Macey to Snotlout, who pretended to be grateful, but tossed it aside as soon as he looked away.
Tuff brought out a box of weapons, saying Astrid could pick any of them, except Macey and a couple of other things.
Macey was seen in a flashback being used by Tuffnut to "interrogate" Gothi.
While Gruffnut is impersonating Tuffnut, he tells Ruffnut that she can carry Macey while on patrol, tipping her off that maybe her "brother" isn't who he claims to be. During the skirmish on Barf and Belch's back while in the air, Tuff calls to Ruff to toss him Macey, with which he then manages to defeat Gruff and knock him off the dragon's back to the waiting Hunter ship below.
Macey was the focus of this episode. Tuffnut unintentionally broke it when trying to destroy a dragon-proof chain. Saddened, he and Ruffnut went to the Northern Market to find a blacksmith who can fix it. The twins managed to convince a blacksmith to fix Macey after telling a lie that they took down Hiccup. Macey was then taken by a Dragon Hunter to an island where Project Shellfire was under construction. Disguising themselves, the twins tried to recover Macey, and Ruffnut advises Tuffnut that he had to let Macey go for bringing in information about what Viggo was working on. Later on, Tuffnut retrieved Macey and used it to battle several Dragon Hunters. When Hiccup and the others got trapped in a flooding cage, Tuffnut threw Macey into the rotating gears to temporarily prevent more water from flooding. Macey was eventually destroyed, with only her handle intact. When the Dragon Riders returned to the Edge the next day, they gave Macey's handle a Viking funeral. Ruffnut shot a flaming arrow to her boat and missed before Hiccup tells Toothless to burn it with his plasma blast.