Esper ( Revenant Wings ) The Espers , called Yarhi by the aegyl , in " " are distinct from those of the other summons in Ivalice games . Unlike the Scions or the Espers of " Final Fantasy Tactics " , these Espers are unique to Lemurés in origin , and have their distinct history . For unknown reasons they still resemble the standard Espers of Ivalice . This similarity to Ivalice summon magick leads to them being called Espers by outsiders . There are a total of 51 Espers . Story . The Espers of Lemurés are , unlike those of Ivalice , born from the stolen anima of the aegyl through the use of auracite . These stolen aegyl souls gathered , creating their own plane , the World of Illusion , and it is from here they can be called to the material world via a Summoning Gate by a person carrying auracite . In doing so the summoner ' s anima is eroded , creating more Espers . The Espers from " Final Fantasy XII " are also present in " Revenant Wings " . They were attracted to Lemurés due to all the activity going on . Vaan and his sky pirating friends at first try to protect the auracites from harm , but come to learn of them sapping the aegyl of their anima . After all the auraliths are destroyed Vaan and his friends are transported to the World of Illusions where they learn more about the nature of anima and the Espers . The group fights against the aegyl god Feolthanos who has purposefully been draining the aegyl of their anima and who wants to attack Ivalice . After Feolthanos and the auraliths are all gone , the aegyls ' anima is released and the Espers and their world fade from existence . Gameplay . Espers are bought on the Ring of Pacts . There are four main elements , plus two additional areas for summons . Each element , bar Holy , has melee , ranged and flying summons . Each of these areas has three ranks , with rank 1 being the weakest and rank 3 being the strongest . The player does not need the rank 1 summon to get the rank 2 summon , and neither are the rank 2 summons required to get the rank 3 summons . Melee summons are strong against ranged , ranged are strong against flying , and flying are strong against melee . Some summons , mainly the Espers from " Final Fantasy XII " , must be defeated in battle before becoming available on the Ring of Pacts . The Espers act as party members in battle , and multiple instances of each can exist on the battlefield at any given time , bar rank 3 summons , that always appear alone . Non - elemental summons . Non - elemental summons have no weakness or resistance . They are best used for fighting a group of enemies with different weaknesses . The most powerful summons are non - elemental . Fire summons . Fire summons are weak against water summons . They are strong against earth summons , and some water summons . Water summons . Water summons are mainly weak against thunder summons , while Shivan , Shivar , and Shiva are weak against fire . They are strong against fire summons , and some thunder summons . Thunder summons . Thunder summons are mainly weak against earth summons , while Ramih and Remora are weak against water . They are strong against water summons . Earth summons . Earth summons are weak against fire summons . They are strong against thunder summons . Holy summons . Holy summons have no offensive capabilities . Instead , they can only heal party members with their attacks . The sole exception is Ultima ' s special attack , Eschaton . Etymology . Spear is the typical weapon of the aegyl , alluding the Yarhi being the blade of the aegyl .