|This article contains canon information corresponding to the Tales of Arcadia franchise. That means all information in this article is true and has appeared/been validated officialy on-screen.|
The Amulet of Daylight is a magical amulet created by Merlin, which acts as both the source of power and a symbol of office for the Trollhunter. To make the amulet work, the user must say, "For the glory of Merlin, daylight is mine to command." After acquiring all three Triumbric Stones, the user can say, "For the doom of Gunmar, Eclipse is mine to command." 
The Amulet was said to be created by the wizard Merlin for his Trollhunters to use. Merlin took Morgan's left hand to make the amulet. According to legend, he made it malleable so each Trollhunter could combat darkness that even its creator could not foresee. It is unknown how old the amulet is or how many Trollhunters have wielded it.
Sometime after trolls settled in America, the amulet fell into the possession of Kanjigar the Courageous, who would become one of the best Trollhunters. To focus on his training and serving trollkind, Kanjigar chose to distance himself from his young son Draal, who began training to become worthy of the amulet.
Kanjigar was defeated and disarmed by Bular, the son of Gunmar, under a bridge in Arcadia Oaks. To prevent the amulet from falling into Bular's hands, Kanjigar sacrificed himself by falling into the sunlight, petrifying himself and keeping the amulet out of Bular's reach.
First Human Trollhunter
On his way to school, Jim and his best friend, Tobias Domzalski, discovered Kanjigar's remains in the canal, along with the amulet, which called Jim's name. After school, Jim managed to activate the amulet while also meeting his trainers, Blinky and AAARRRGGHH!!!
When the Amulet is activated, it grants the user the Trollhunter Armor and the Sword of Daylight. The amulet can be ripped off its wearer or knocked off by excessive force. The amulet has the ability to generate a surge of light that can blind or even petrify trolls, except for those that are immune to sunlight. This light will not damage the Trollhunter, even if they are a troll; however, the amulet will not protect a troll from natural sunlight.
The amulet responds to its wearer's emotions, as seen by it activating when the user is stressed and deactivating when the user returns to a normal emotional state. Blinky notes that the amulet's effects will differ for Jim due to his human physiology. With time, the amulet will respond to its wearer's desires as well, allowing the Trollhunter to manipulate the armor anyway it desires.
The amulet will return to its user if discarded, as Jim attempted to do in "Wherefore Art Thou, Trollhunter?", as it is now permanently bonded to him. However, if the amulet is stolen, as Gnome Chompsky managed to do in the following episode, it will not return. This caveat can be circumvented in times of mortal danger, as Jim, besieged in the woods and defending Claire, managed to call to the amulet, which escaped Stricklander's clutches in the museum and flew to its master's aid.
The amulet, as well as its armor and sword, will alter themselves to their user's proportions. When Jim first activated the armor and sword, they were set to the size of Kanjigar, its previous owner, before shrinking to fit Jim. Furthermore, if the wearer's size has been unnaturally altered, such as through a Furgolator, the amulet can change itself to match this size, which Jim used to fight Chompsky after the gnome had disarmed him.
The amulet's other abilities, include translating Trollspeak to English and vice versa.
Additionally, the amulet can be opened and upgraded with special stones. The specific abilities of each stone are different, but certain combinations of stones will result in upgrades to the armor's functionalities, including different weapons, self-duplication or the capability to walk on walls. When all 3 Triumbric Stones are placed in the amulet, the armor changes to a black/red color scheme and the Eclipse Armor and the Sword of Eclipse become available. The amulet's faceplate can be removed and used to activate the Killahead Bridge.
Should the Trollhunter fall in battle, the amulet will speak in the voice of the fallen Trollhunter, calling out to its new owner should they be nearby.
Most uniquely, when Porgon the Trickster combined his magic with Akiridion technology to reset time, the amulet protected Jim's memories, enabling to him to retain awareness within the time loop.
- In the books, the amulet didn't have magical powers, it only gave Jim the ability to understand what the trolls were saying.
- Although Merlin built the amulet, it still returns to the Trollhunter it chose, as shown in "A House Divided". However, it is also revealed that Merlin is the only one, besides the Trollhunter himself, who can remove the amulet from the armor. Others who try to take the amulet off end up getting blasted away, as shown in "Wherefore Art Thou, Trollhunter?" when Draal tried to remove the amulet from Jim, only to get blasted back.
- In "The Oath", Jim once questioned if Merlin was the one who was making the Amulet of Daylight by himself. As revealed in the beginning during a flashback, Merlin seemed to have an unknown assistant who apparently has created the map/power source inside the amulet just before Merlin completed it himself.
- In "D'aja Vu", Princess Aja mistakenly refers to the amulet as an omelette.