Brynhildr ( summon ) Brynhildr is Sazh Katzroy ' s Eidolon in " Final Fantasy XIII " . She is a Fire - elemental knight who wields a large bludgeon that also shoots projectiles . Though Brynhildr is naturally Fire - elemental , Sazh can bestow En - Spells on her to change her element al characteristics allowing her to use a wide array of spells based on which enhancements Sazh has cast on her . Sazh ' s Gestalt Gauge increases by driving up enemy chain gauges and by augmenting himself and Brynhildr with status enhancements . During her Gestalt Mode , Brynhildr transforms into a sports car . The text on on the symbol that appears in the ball of fire reads : Brynhildr doesn ' t make an appearance in " Final Fantasy XIII - 2 " , although a concept artwork of a blue version of Brynhildr was included in the " Final Fantasy XIII - 2 Ultimania Omega " . Story . " Final Fantasy XIII " . After having learned of Vanille ' s involvement in the branding of his son , Sazh corners her in the Fiendlord ' s Keep of Nautilus . Sazh ' s turmoil summons his Eidolon , Brynhildr , and together with Vanille the two defeat the Eidolon . Later , when the party returns to Cocoon they crash a grand prix and ride through the racetrack with their Eidolons in Gestalt Mode , Sazh steering Brynhildr in her race car form . " " . Brynhildr , alongside the other Eidolons , answers Lightning ' s call for help in the final battle against the god Bhunivelze . Following Nova Chrysalia ' s destruction , the Eidolons bid farewell to their old comrades before fading away . Gameplay . Battle . Sazh and Vanille face Brynhildr as a boss in Nautilus Park , as a test to prove Sazh ' s strength to her . After passing the test , Brynhildr joins as Sazh ' s summon . Brynhildr yields to those who amass chain bonuses and strengthen their allies . As a result , the Synergist role is crucial to this battle . As chain bonuses are difficult to gain on Eidolon battles , the best strategy is to utilize the Tide Turner paradigm to both strengthen Sazh and Vanille while weakening Brynhildr , then shifting to Dualcasting to build chain bonuses . Summon . Stats . Brynhildr has 4 ATB slots . The Eidolon ' s rank is the sum of Sazh ' s current Crystarium level and the number of roles Sazh has advanced to level 5 . Abilities . Brynhildr uses Slash twice followed up with Valkyrian Scythe and finishes with Heat Burst . She targets the same enemy Sazh is targeting . If ATB Boost activated the previous turn , Brynhildr will follow up Pyroburst with another Valkyrian Scythe followed by another Pyroburst . While Brynhildr ' s ATB gauge is filling , she moves toward the enemy . Other appearances . " Final Fantasy Legends II " . Brynhildr appears as an obtainable summon . She can be obtained through the summon drawing shop . An alternate variant , Brynhildr Ω , also appears as a summon . Brynhildr appears as a high level fire - elemental summon whose special attack is Múspell Flame , which deals fire - elemental damage to all enemies . Summoning Brynhildr costs 3 points from the Consumption Gauge . Depending on the Brynhildr summon ' s type and rank , the user is able to learn the following abilities : As opposed to most games using her recurring " Final Fantasy XIII " design , this game designs her to resemble that of a Valkyrie . " Dissidia 012 Final Fantasy " . Brynhildr appears as a summon . When summoned , her ability , Múspell Flame , instantly doubles the Stage Bravery , and doubles the base Stage Bravery for a period of time afterwards . She can be purchased at the Moogle shop at Crescent Lake in Chapter 1 of Main Scenario 012 , and at the Moogle shop near Pravoka in the Confessions of the Creator scenario , for 120 KP . " Final Fantasy Artniks " . Brynhildr appears as an obtainable card . " Final Fantasy All the Bravest " . Although Brynhildr herself doesn ' t appear , her weapon does . Sazh uses the weapon to attack the enemy with Pyroburst . " Final Fantasy Trading Card Game " . Brynhildr has a card featuring its drawn artwork for " Final Fantasy XIII " . It is a fire - element card . Another card depicts Brynhildr in Gestalt Mode with Sazh . " Triple Triad " . Brynhildr in her Gestalt form appears on " Triple Triad " cards in the version available via " Final Fantasy Portal App " . Etymology . Brynhildr Eidolon ' s finishing attack , Múspell Flame , refers to Múspellsheimr .