Gem of Tetsurri is a strange ruby gem only appearing in Mortal Kombat: Defenders of the Realm. It is a relic that is actually a crystallized heart of a dead warlord. The Gem can be used to make allies turn against eachother, which eventually escalates into the beings trying to kill eachother. Quan Chi used the gem to try to make Mortal Kombanants fight against eachother. The Gem appears in Worst Hero And Villain War Ever, where it is used to turn Colonel William Guile evil.
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