Demon Wall ( Final Fantasy XII ) The Demon Wall is a boss in " Final Fantasy XII " ; two Demon Walls are guarding the Tomb of Raithwall from intruders . It is said they have the Dynast - King ' s likeness carved onto them . Battle . The Demon Walls will continually advance on the party and its proximity to the back wall is indicated by a gauge to the right of the screen . When it gets to the end of the hall a cut scene shows the wall crushing the party , inflicting KO on all active and reserve party members , causing a Game Over . The first Demon Wall is optional and can be fought later . The second Demon Wall is not , and once the player enters the Hall of the Sentinel the Demon Wall will advance towards the player . The Demon Wall has a special attack , Telega , which inflicts X - Zone , a status effect that teleports a character to an alternate dimension , which makes the character inaccessible until the player moves to a new area . It also has some powerful spells in its arsenal . Demon Wall inflicts characters with Poison , Sleep , Blind , and Silence . A potential aid is the placing of several pedestals lining both sides of the Hall of the Sentinel . Touching these pedestals will either slow down or speed up the Demon Wall , depending on which pedestal is chosen . The order of the pedestals is the same every time ( this is not true in the Japanese version , in which each pedestal ' s effect is random on each playthrough ) . Battle speed plays a role in this battle : if the battle speed is set on high , the party ' s attacks will be faster on the Demon Wall , even though it will be moving at the same speed . Strategy . The most efficient means of bringing down the Demon Wall , short of launching an all - out assault , is the use of Reflect and Aero . Aero is the spell of choice here because it ' s available at an early time , and after Dark , it ' s one of the few early spells which targets multiple enemies . Aero , despite a higher MP cost , is also preferable to Dark because the Cherry Staff enhances its damage , like the Flame Staff does with fire - type spells . If all members of the party have the Cherry Staff equipped and know Aero , the player can simply buff them with Reflect and set their gambits to spam any ally with Aero . Every time Aero is cast , all four party members ( including Vossler ) , will project a missile at the Demon Wall for around 300 - 600 damage each . If the player is using a more traditional party , and not everybody knows Aero , they can try casting Berserk on the heavy hitters before applying Reflect . With one character covering magic , and another character keeping the Reflect buff active , Vossler and the other attackers can make up the difference quite nicely . Optional Demon Wall . The optional Demon Wall is much stronger and more difficult than the required one ( hence the location name Hall of the Destroyer ) . Beating the optional Demon Wall leads to the possibility of obtaining a Demonsbane Sword , an advanced weapon for this point in the game ( Attack power of 59 ) . Because of the short time in store before the Demon Wall crushes the party against the wall , combined with the arsenal of negative status effects it constantly casts on the party , the party stands little chance of winning a battle when they first encounter it if they have not learned their Quickenings yet . Quickening chain is by far the best early - in - the - game strategy . However , if the party is around the level 16 - 18 the above strategy for the non - optional Demon Wall can be used , but it is recommendable to turn the battle mode to Wait , rather than Active , so the player can keep spells coming out quickly . The player should also have either Ether s , Channeling augments , and / or two to three mist charges for MP . Demonsbane Sword . After having defeated both Demon Walls , the party can touch the Blue Crystal where the first demon came out to reveal a secret area . The treasure , which sometimes contains the Demonsbane sword , is at the bottom of either stairwell ( they both lead to the same place ) . Because the chances of the sword spawning are slim , it is advised to save the game before entering . If the sword is not in the chest , one can restart and try again . At this point in the game , it is one of the most powerful weapons , being beaten only by ; the Burning Bow ( rare drop from Dive Talon s ) , Arcturus ( Bazaar ) , Francisca ( Bazaar ) and Zwill Crossblade ( Bazaar ) , but these four weapons are much harder to obtain before entering the tomb . The chest has a 70 % chance to spawn and if the chest spawns , it has a 27 . 5 % chance to contain Demonsbane . The player may not equip the Diamond Armlet . In the " International Zodiac Job System " version , the chest contains only a Scathe Mote .