Discord's amulet
This amulet was an object wielded by Discord disguised as Grogar.
Its properties were unknown, though he carried it into the lair of Grogar to help the Legion of Doom in their conquest of Equestria. However, the legion turned on him before he could display the abilities of the amulet, which they destroyed before using the Bewitching Bell to drain Discord's magic.
Appearances
Trivia
The amulet resembles the Flashstone wielded by Squirk in the original My Little Pony series story, "The Ghost of Paradise Estate."