Northern Cave ( Final Fantasy VII ) The Northern Cave , also called the Great Cavity is a location and the final dungeon of " Final Fantasy VII " . It is situated at the bottom of the North Crater that takes up much of the Northern Continent . The inside is a large cave system where the game ' s most powerful monsters reside . It is visited twice in the game , once briefly towards the start of Disc 2 , and again at the end of Disc 3 . At the end of the game Sephiroth waits at the cave ' s bottom , at the Planet ' s Core as the game ' s final boss . Story . " Final Fantasy VII " . The Northern Cave was created with the North Crater when the asteroid or meteorite impact that contained Jenova hit the Planet thousands of years ago . When Sephiroth was defeated by Cloud Strife at the Nibelheim Mako Reactor during the Nibelheim Incident , he traveled through the Lifestream to the Northern Cave to recuperate . Controlling Jenova and making her use his form , he leads the Sephiroth Clone s to the crater along with Cloud and his party for the Reunion . They bring the Black Materia , which is used to summon Meteor . The Weapons awaken , sensing the cataclysm , and rampage across the world . Sephiroth seals the crater ' s entry with a force - field , and begins to remake his body to prepare for his ascension into godhood . Shinra Electric Power Company uses the Sister Ray cannon to destroy the Diamond Weapon and blast through Sephiroth ' s shield . With the defense down , Cloud Strife and his party storm deep into the Northern Cave to defeat Sephiroth and release the trapped Holy Aeris had summoned before her death . After Sephiroth ' s defeat , Holy is released in a massive burst . The party escapes on the " Highwind " before being caught in the uproar of magical energy . Though Sephiroth and Jenova are defeated , Jenova ' s remains linger within the Northern Cave . The Turks steal them before the Remnants of Sephiroth can get a hold of them to resurrect their master , but Elena and Tseng are captured during the ensuing battle , and are rescued by Vincent Valentine . Locations . Reunion Area . This area has walls composed of Materia , and is the resting place for Sephiroth , and where Jenova , being controlled by Sephiroth , leads the Sephiroth Clones for the Reunion . The Weapons also rest here . This part of the cave is only visited once in Part 2 . Beneath this area of the cave continues a path down towards the center of the Planet . These parts of the cave are visited as the final dungeon in Part 3 . This area has set enemy formations including the Tonberry . Random encounter s here are disabled , and the player never has control of the character in the area , so they are never fought . Thus , Tonberries can only be encountered on the Gold Saucer Battle Square . Another battle exclusive to this area is a battle against a Killbin and two Gremlins , two enemies never otherwise fought together . Cave Opening . A circular path from the mouth of the crater leads into the North Cave beneath the crater where Sephiroth awaits . The long and winding path leaves the party open to many random encounters . Enemy formations encountered here are of the weaker variety available in this dungeon although the Master Tonberry and Scissors are able to kill party members in a single blow . Gargoyles encountered here can also inflict slow numb on party members and are immune to all attacks until they wake up in the battle and begin to move . Some of the rock formations will fall as the player steps on them but this will never result in anything negative or damaging and only happens the first time the player visits the area . The player may turn around and leave the dungeon at any time . Should they choose to , they will appear in a small cave near the mouth of the crater opening and can climb out a rigid rock formation appearing on the players right hand side facing the screen , which means this is not a point of no return . Up Descent . Lake Crossing . The player must enter the water to get through the area . Final Descent . Cloud and his allies gather here before the final battle against Sephiroth . Moving beyond this point is the point of no return . Planet ' s Core . This is where Sephiroth has reconstructed his new body and where the final battle takes place . Treasures . The Northern Cave has significantly more items than any other location in the game . Item duplication trick . The items received from party members at the bottom depend on which way the player sends the characters when splitting up . This can be used to get a third Mystile armor from Tifa . At the Northern Cave at the point where the party is split down the two paths the player should send Tifa down the right path , and tell Cloud to go left . When Cloud ' s path divides , the player should choose the lower path . When going down at the bottom where all the paths converge , the player must not walk toward the stairway that leads further down . This would cause the other party members to appear , which causes all chests to be registered as " open " and the third Mystile will be missed . Instead of going down , the player should go back up the cave by taking the entrance to the lower path up to where the left and right paths split , then go down the right path and grab the second Mystile . The player can now go all the way down to the end again and walk toward the path leading down causing the other party members to appear . When talking to Tifa she should give a third Mystile ( though in the PlayStation version the player will appear to have received ' Mythril ' , which is a key item . A Mystile will still be added to the player ' s inventory ) . It is possible to duplicate all of the items found on the paths the player sends the party members to that Cloud won ' t go himself . If one sends more party members than there are items on the pathway , the remaining party members will hold Megalixirs . List of all the items that can be duplicated this way : Specifically , If in any junction where the party splits the player sends Yuffie alone in any way , once the party gathers up at the bottom , Yuffie will not give the items she found to the player , and will lie she found nothing . At this point , any characters sent alongside Yuffie remind her , and she grudgingly gives the items to Cloud , but if Yuffie was sent alone she will keep the items . Enemies . Final Descent . The final descent comprises of two screens containing 15 platforms . On each platform the player has a 29 . 7 % chance of entering a battle . There are three possible enemies to fight and each have a different chance of being fought . Other appearances . " Dissidia Final Fantasy " . The Northern Cave is the representative arena for " Final Fantasy VII " under the name Planet ' s Core . It is here that Cloud battles and defeats Sephiroth at the climax of his storyline . Shortly after , Terra enters the Planet ' s Core to look for her ally , the Onion Knight , and Cloud battles her when she loses control of her esper powers to pacify her . The Warrior of Light fights Sephiroth at the Planet ' s Core to rescue Firion , and Cecil faces off against Exdeath to defend Golbez . The arena consists of a large circular platform at the bottom of the arena , with floating rocks and square pillars in the air surrounding it , forming a rough path spiraling to the top of the arena . Tendrils of Lifestream connect the platforms and can be slid on using Quickmove . Powerful attacks can destroy the platforms and pillars if a character is knocked into them . In the arena ' s Ω form , after a period of time has passed , the arena shakes and the platforms and pillars float upwards , reminiscent of what happens after the battle with Jenova∙SYNTHESIS in " Final Fantasy VII " . Eventually the stage calms down , but the stone platforms are gone , there are more floating pillars , and more strands of Lifestream have appeared on the stage . EX Cores will teleport if the platform they are on is destroyed , and the Bravery pool will continually rise . The Materia is the battlegen item obtained through stage destruction in this area . " Dissidia 012 Final Fantasy " . The Planet ' s Core returns in this prequel to " Dissidia " . Sephiroth confronts Tifa in this area . " Theatrhythm Final Fantasy " . The Northern Cave appears as the FMS for " Judgment Day " , and the depths of the planet ' s core where Safer∙Sephiroth is fought appears as the BMS for " One - Winged Angel " . " Theatrhythm Final Fantasy Curtain Call " . The Northern Cave returns in both the FMS and BMS of their respective themes . Musical themes . The Northern Cave ' s official background theme is " Judgement Day " , a track found in " " .