Originally Posted by
Nalien
Off hand slot is honestly how I think Summoners Egi-Glamour system should have been worked, rather than the lame text command we got;
Carbuncle Ruby (Dyable) equipped = you summon Carbuncle.
Inferno Gem equipped = you summon Ifrit-Egi, for the caster and tank variant as well.
and so on
Could even have added some additional lite-content to the game, depending how SE saw fit to have us obtain such items. Personally I'd have made them EX drops, giving some new purpose to do them outside the weekly Khloe book. Ifrit/Garuda/Titan would all probably be quest related drops, but going forward with more Egi glamours you could have had them drop from their respective Primal fight at least.