Faeryl Faeryl is a boss in " Final Fantasy XIII - 2 " , a dragon that lives on the Archylte Steppe in an unknown period of time . It initially appears on clear , sunny days , but the weather must be changed to rainy ( up / down ) to chase away the Long Gui blocking the way to it before it can be fought . " A stone recovered from inside a faeryl . This substance was responsible for summoning up a tempest , sucking up huge numbers of monsters , and sending them flying to another spacetime . " Datalog . " Faeryl monsters like to swallow crystals that sit in their stomachs and ignite the flames they breathe from their mouths . This particular monster must have swallowed the fragment by mistake , thinking it another crystal . " Story . Swallowing the Black Hole Gem artefact , the Miniflan that are sucked into the faeryl ' s mouth are transported to Sunleth Waterscape at 300 AF where they merged into Royal Ripeness . Tracking faeryl down , Serah , Mog , and Noel kill the monster and obtain the Black Hole Gem reducing number of miniflan being transported through time . Battle . The Faeryl opens with the Megaton Charge , which takes several turns to cast , but damages all party members several times in a lengthy attack animation . Following on from this attack , the Faeryl executes a range of sweeping attacks that hit multiple party members and can also cause Wound damage ; Great Roar in particular can cause heavy damage . The Faeryl will eventually use Megaton Charge again . Strategy . Depending on Noel and Serah ' s maximum health ( it is recommended they have at least 1 , 000 HP before beginning the battle ) , players may either consider beginning the battle by buffing defensively with Synergists ( Noel can learn both Protectga and Shellga ) , or starting with the paradigm Relentless Assault ( COM / RAV / RAV ) and then switching to Tri - Disaster ( RAV / RAV / RAV ) to raise the chain gauge as fast as possible . When the Faeryl executes Megaton Charge , it is good to switch to a paradigm with Sentinels and Medics to mitigate damage and heal quickly afterwards ( before the chain gauge empties ) . Players should focus on quickly stagger ing the Faeryl , but will also need to deal with its barrage of powerful attacks . Once it is staggered , switching to Cerberus ( COM / COM / COM ) is a good way to deal damage , using Medics or Potions to heal when necessary . It will likely take two staggers to defeat the Faeryl , but with the right combination of appropriately leveled Paradigm Pack monsters and correctly - timed offensive buffs ( such as applying Bravery and Faith before staggering it ) , it is possible to defeat it in one . Saboteurs are largely unhelpful due to the Faeryl ' s immunity to most status ailments available at this point in the game . Having a permanent Medic or Sentinel across multiple paradigms can help players keep on the offensive without focusing on their health too much . Other appearances . " Final Fantasy Trading Card Game " . A card depicting Faeryl depicted with his render appears in " Final Fantasy Trading Card Game " . Etymology . In the Japanese version , Faeryl is known as Marduk . The English name may be based on the word " feral , " which has similar pronunciation .