Flare II is a fire-elemental Black Magic spell in Final Fantasy XI. It is the second tier of the Flare Ancient Magic spell.
Obtained
Flare II, along with the other of the Black Mage's second tier Ancient Magic spells, is learnable at level 75. Flare II's scroll can be bought from Susu in Lower Jeuno for 129,180 gil.
Use
When used, Flare II deals massive fire damage to a single enemy and lowers its resistance against the water element for a period of 15 - 30 seconds. Due to the latter effect, Flare II can be easily be followed up with earth spells such as Waterja and Water VI.
Through Merit Points, Flare II's Magic Burst potency can be increased by 3%, while its magic accuracy can be increased by 5.
In addition, Trust party members such as Iroha II can use Flare II in combat against enemies.
Other appearances
Final Fantasy XIV
The second phase of Abyssos: The Eighth Circle (Savage) uses Tyrant's Flare II (タイラント・フレアII, Tairanto Furea Tsū?, lit. Tyrant Flare II).
Final Fantasy Record Keeper

Final Fantasy Brave Exvius

Behind the scenes
When originally introduced to the game, Flare II could only be learned by Black Mages level 75 and higher by spending 3 Merit Points to purchase it from the merit menu. Following the June 2019 patch update, Flare II was changed to become a purchasable spell in Lower Jueno.
Etymology
flare is a pyrotechnical phenomenon that produces intense amounts of heat and energy that does not result in an explosion (an immediate release of energy).
AIn the case of Final Fantasy, while this may seem weaker than an explosion, a flare is a contained release of energy, which fully exposes the enemy to the source rather than blow them away from it after a while.