The Gem of Ermac is a magical emerald gem in a small part gold, part silver medal belonging to the ninja warrior Ermac, and it first appeared on his forehead in Mortal Kombat: Deception and reappeared as the 21st Relic under the name "Ermac's Gem" within the Konquest mode of Mortal Kombat: Armageddon. It can be found in Arctika.
Legend says that this mystical emerald gem increases Ermac's telekinetic power ten-fold. This gem is also said to harness great telekinetic energy within its shell.
Ermac's Gem returns still on Ermac's forehead within his updated costume in Mortal Kombat (2011). It is a little smaller this time.
However, in Mortal Kombat X and Mortal Kombat 11, a gem changes from emerald to red. This is not small, but large.
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