Lucrecia ' s Cave Lucrecia ' s Cave is a location in the " Compilation of Final Fantasy VII " hidden behind a waterfall in the center of the Western Continent on the borders of both the Gold Saucer Area and the Nibel Area , although the cave is only accessible from the latter . The cave holds importance to Vincent Valentine . The cave is never referred to by a proper name in - game , known only as ? ? ? in the menu in " Final Fantasy VII " . The location is referred to as " Lucrecia ' s Cave " in the BradyGames guide for " Final Fantasy VII " , and referred to by a similar name in the " Ultimania " guides for both " Final Fantasy VII " and " Dirge of Cerberus - Final Fantasy VII - " . The location is also commonly known as " Crystal Cave " by fans . Story . " Final Fantasy VII " . Lucrecia Crescent moved to the cave after the birth of her child , Sephiroth . She wanted to isolate herself from the world and die for her sins , but was unable to due to the Jenova cells inside her . If the party visits the cave with Vincent they hear the tale of Sephiroth ' s conception and the origin of Vincent ' s powers . When Vincent tries to approach Lucrecia she tells him to stay away . She says she has been dreaming of Sephiroth lately , and Vincent lies that Sephiroth is dead , though she knows it ' s not true . When they return to the cave later Lucrecia is nowhere to be seen , but Vincent finds a weapon and a Limit Break manual in the cave . " Dirge of Cerberus - Final Fantasy VII - " . Lucrecia ' s Cave is revealed to be the place where Chaos is supposed to emerge at the appointed time . After Sephiroth ' s death , Vincent visits Lucrecia . She has encased herself in crystal for feeling guilty for Vincent ' s " death " and transformation , and for bearing the sin of having given birth to Sephiroth . After felling Omega Vincent thanks Lucrecia for giving him a new lease on life . A tear rolls down Lucrecia ' s cheek as Vincent leaves the cave . Location . Lucrecia ' s Cave is located at the center of Gaia ' s western continent . The stream it is found behind divides the Gold Saucer Area and the Nibel Area . In " Final Fantasy VII " Lucrecia ' s Cave is a one - room location entered from the World Map . The cave can only be accessed by green , black , or gold chocobo , or by going through an underwater tunnel on the northeast of the continent beneath the North Corel Area by submarine . There is nothing to interact with in this area unless certain requirements are met for the sidequest . Quests . " Final Fantasy VII " . Death Penalty and Chaos . After Cloud has returned to the party after the Mideel events in Part 2 , the player can start a sidequest at the cave . The player must have acquired Vincent and have a means of getting to the location . If Vincent is in the player ' s party and accesses the cave , Lucrecia will appear and tell of the experiments involving herself , Sephiroth , and Vincent in Shinra Mansion . Afterward the player must exit and fight ten random encounters . Returning with Vincent in the party , his Limit Break manual and his ultimate weapon , Chaos and Death Penalty respectively , can be found at the back of the cave , which is otherwise empty .