Marilith ( Final Fantasy XII ) The Marilith is a Rank V Mark in " Final Fantasy XII " . It is the ninth mark mentioned in the Clan Primer and becomes available after vanquishing the Wyvern Lord . Marilith is found in the Invitation to Heresy area of the Zertinan Caverns , in the sunlit room ( bottom right portion of map , where the shape of the room looks like the letter " C " ) , but the party must remain in the area for five minutes before it will show up . Its name is a reference to Marilith , the Fire Fiend from the original " Final Fantasy " . It is also fought in the " International Zodiac Job System " Trial Mode at stage 34 along with three Bogey s . How to find . When the player enters the Zertinan Caverns via the south part of Dalmasca Westersand they will be right by the area where Marilith resides in Invitation to Heresy . Marilith will jump out from the grass at the sunny spot to the west of the area . The player must have cleared the area of monsters . After five minutes , go to the bottom of the upside down , F - shape place in the map and Marilith will appear . It is not necessary to walk during the five minutes . Battle . Marilith starts out with Protect , Shell and Haste . Marilith attacks fast , but just with normal attacks and Tail Spear , which can inflict Slow and Sap . Marilith is immune to Thunder damage and weak against Water damage . Even though the mark has Ignore Evade , it can be inflicted with Blind or Silence , and blocking or parrying ( with Jade Collar ) its attacks is possible . Marilith will usually always attack the closest character , but if a ranged attacker uses say , a Water Mote on it , the Marilith may change target and immediately use Tail Spear on them . Using Water magick however , doesn ' t make it change target unlike items . Marilith has an increased likelihood of combos towards the end . After having lost half of its HP , Marilith will enter a new battle phase and will no longer ignore shields . Strategy . The party should start out by casting Dispel on Marilith . Getting Haste back up after being afflicted with Slow is useful as not to lose time in an already fast fight . Because Marilith uses physical attacks , Protect is helpful . The most effective debuffs to cast are Blind and Slow . The easiest way to inflict Marilith with statuses is with the Nihopalaoa + Remedy trick . As Marilith will usually attack the closest character , the player can set one melee character as bait and equip the others with ranged weapons and magick , however , if the ranged attacking character is targeted they may die almost instantly if not fully prepared . After Marilith is below half of its health any close - range attackers should equip a shield to protect against Marilith ' s combo rate ; with shield block and Blind the party can block many of its attacks . To quickly reduce its HP down below half , Quickenings work well . To retaliate after performing Quickenings , a melee character should keep Marilith attacking him / her while the other two resort in attacking from a distance and use Charge to restore their MP . The melee character is greatly recommended with the best Evasion granting shield available , and the Main Gauche , as it provides 34 Evade . Once the Marilith is blinded , its attacks are almost useless to a melee character with 50 Evade and with the Gauntlets accessory . Shield + augments are recommended , and if the character has 50 Evade , equipped with the Gauntlets and all of the Shield + augments , Marilith ' s attacks while blinded have a mere 2 / 15 chance to hit , but the two can still be blocked with the Main Gauche ' s Evade . If feared that the melee character may not be able to tank properly , the character should equip the Shielded Armor for constant Protect buff , and Regen helps as well . Magick casting characters should use the best staff available and only the Water spell . Since Marilith may speed up again after recovering from Slow , the magick - oriented character should have either the Magick Gloves or the Serenity augment with full HP so that they may inflict Slow with greater accuracy . If , say , the character uses Water magick , wields one - handed weapon , and the best shield available , the Jade Collar will be their best friend . The character which uses the Crossbow should also equip the Jade Collar in case Marilith will change targets , but the Jade Collar ( even with high Evade ) may be useless against the Marilith unless the Marilith is blinded . Rewards . The player will also receive a Serpentwyne Must after the battle , which is given to the Tavernmaster when the hunt is reported . If the player talks to Migelo after this hunt , they will find out he is the one who ordered the serpentwyne .