Aeshma is immune to physical attacks, and can cast the powerful Flare and Ultima spells and use Emblem of Thanatos. In addition, it can steal HP and MP from a character with Drain and Osmose, respectively.
Automatically recruited after completing Aka Manah's fiend tale, Aeshma comes knowing Firaga, Cure, and Drain. It also has Ailment Def., which protects it from any status ailment. It has high Magic, Magic Def., Accuracy, and Agility. Its Strength and Defense are mediocre, and its Luck and Evasion are low. Unlike an enemy Aeshma, this one is not immune to physical attacks, although it can learn Thanatos Emblem and Total Limit Break (allows dealt damage and max HP to reach 99,999) like with its lesser counterparts.
At the conclusion of its fiend tale, Aeshma dies but is not reborn stronger this time. A Jahi arises from its pyreflies and provokes Shinra to prove his mettle by raising its power, after which Jahi is automatically recruited.
Aeshma appears in the Fiend Arena, found in three teams that are featured only in the Fiend World Cup: Shadow Envoy (Aeshma x2), Moonflow Guardian (Aeshma, Monolith), and Abyssal Judge (Aeshma, Arast). All three teams can pose a huge problem to any parties that use only physical attacks, especially when the Fiend World Cup first appears as the Fiend portal, which leads to a Game Over if lost. For this reason, the player must employ characters and creatures capable of using magic or other abilities that deal special damage.
Aeshma is the Younger Avestan name of Zoroastrianism's demon of "wrath." As a hypostatic entity, Aeshma is variously interpreted as "wrath," "rage," and "fury."