Diamond Weapon ( Final Fantasy VII boss ) Diamond Weapon is a boss in " Final Fantasy VII " . It is one of the Planet ' s many Weapons . The party fights it as it approaches Midgar towards the end of the game . Its attacks include a foot stomp , a blast of magical energy , and its Diamond Flash , a Gravity - based attack with a three - turn countdown that also inflicts Silence . Defeating Diamond Weapon in the PC version re - release unlocks the Diamond Weapon achievement . Doing so in the PlayStation 4 version earns Diamond Disintegrator trophy . Encountering . The Diamond Weapon glitch lets the player avoid fighting Diamond Weapon , but it will ruin the player ' s save file . If the player enters the menu and saves their game exactly when the battle against Diamond Weapon is going to start , and then loads their game normally , the Diamond Weapon has vanished . This leaves the player unable to finish the game as the barrier over the crater is still intact , and the scene where the party is prompted to parachute into Midgar never triggers . If the player attempts to fight Diamond Weapon by ramming it with the " Highwind " , Cid will yell at Cloud for trying to break the airship and demand they fight it on the ground , and the " Highwind " will be pushed back . Because Diamond weapon appears in shallow water , the player cannot use the submarine to block it and the Tiny Bronco is no longer accessible at this point . When Diamond Weapon reaches land , it will stop north of Midgar until the player engages it on the world map . Diamond weapon only approaches Midgar when the player is viewing the world map ; if the player is in the interior of the " Highwind " or the menu , it will not move . Battle . Diamond Weapon ' s laser ray deals 700 + damage to one target . Its foot stomp deals 1000 + damage , and it will use on the party member with the highest current HP . Diamond Weapon is immune to physical attacks until it opens up its armor if hit with a certain number of summons or Limit Breaks . At this point it will use Countdown . Unless killed in three rounds , it will use the Diamond Flash to hit all party members for 7 / 8 of their current HP , and inflict the Silence status , reverting its immunity to physical attacks . During the countdown it is immune to magical attacks and only uses its laser ray . After having used Diamond Flash the first time , the party will need to use three Limit Breaks , not two , to trigger the countdown again . Diamond Weapon never starts the countdown if no summons or Limit Breaks are used . The party can steal the Rising Sun for Yuffie ; this is the only way to get it . When Diamond Weapon is defeated , it does not turn red and phase out like most enemies ; the camera simply zooms in on its head and cuts to the Battle Results screen . This is because the party doesn ' t actually slay the Weapon , rather they only hold it off until the Sister Ray destroys it . Strategy . Good spells to use outside of the countdown phase are Bolt3 , Trine , and Ultima . After being hit by two or three Limit Breaks , the Weapon may open up its armor allowing the party to use physical attacks . It then starts a countdown from 3 , during which it is immune to magical attacks . Diamond Flash can be annoying , as the player needs magic to continue attacking . Thus , it is advised to not use Limit Breaks ; or , alternatively , bring immunity to Silence . Since Diamond Flash charges Limit Breaks , the party can simply use three Limit Breaks in quick succession to restart the countdown ; if the party members have Fire - elemental armor or the Elemental - Fire / Ifrit Materia combo in their armor , this makes it impossible to get a Game Over . AI script . AI : Main AI : Counter - Death AI : Counter - PreTurn