Hm, what if when you defeated a Primal, the Company offers "damaged" weaponry that they found from the site for 5k Seals. Those damaged weapons are rare/ex and can only be turned into ifrit's weapons when repaired with the proper materials. It could be like
Dull ifrit's Blade:Items needed to repair
-Fire imbued Mythril Ingot
-Fire imbued Rosewood Lumber
-Fire Archon Egg
Basically when you see the info under repair it would note those 3 items under it and when said item was used it would turn black signifying that items wasn't needed anymore. Upon getting all 3 repairs you would have to go to the Conjurer's Guild and they would imbue it with the Fire element for 1 Fire cluster, or maybe 12 fire crystals lol. Least then people have a choice of either taking the crafter route to obtaining said item after they defeat ifrit the first time or continuning to fight Ifrit and hope for the best.