In the events prior to the first Mortal Kombat tournament, the original Sub Zero was dispatched by the Lin Kuei to a hidden temple in Earthrealm where a mystical treasure, sought by Quan Chi, was believed to be held. The Temple of Elementals was littered with elite traps and formidable guards, and its doors could only be unlocked by a set of four certain keys in order to progress further. The temple was also protected by four elemental guardians appointed by Raiden -- one each of Wind, Earth, Water, and Fire. The temple was further safeguarded by a mystical seal which thwarted the likes of sorcerors such as Quan Chi from entering, and could be dispelled ony by defeating the guardians.
The forbidden amulet was well-protected with one reason only: It belonged to the fallen Elder God Shinnok. Bestowing great power upon its possessor, in the wrong hands it could bring about calamity. Therefore, at Raiden's direction, the amulet was hidden in the Temple of Elementals, over which Fujin and the other elemental guardians would stand sentry.