Summons are know for doing AoE spike damage in all Final Fantasy Incarnations. If Black Mage is the King of AoE The Summoner should be The God of AoE not a Red Mage dressed up like a Summoner. The Summoner should use Dark Elemental Abilities for sustained damage while the Pets are The Gods of AoE Spike Damage. The Summoner should get the ability to summon the Primal by becoming possessed by the Egi and transforming into the Primal similar to how Lady Iceheart summoned Shiva. The Summoner should get an ability to absorb the Egi and rain down death and destruction.