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Players may step into the world of materia by undertaking the quest "Risky Business" offered by the the NPC Aistan, posted in Ul'dah Merchant Strip (6,3).
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Creating materia requires the “materia assimilator” key item, an apparatus which can be obtained via the quest "Forging the Spirit" offered by the NPC Swynbroes, located in central Thanalan (29,20).
Fingerprints of the Gods can be learned via the quest "Joining the Spirit" offered to Disciples of the Land level 18 and above. To undertake the quest, speak to the NPC Kokosamu located in central Thanalan (29,20).
<Attaching Materia>
To undertake the quest, speak to the NPC F'hobhas located in central Thanalan (29, 20).
To exchange your regular melder for the augmented version, simiply speak to the NPC Mutamix located in central Thanalan (29,20).
It is possible to have equipment purged of materia by paying a fee in gil to the NPC Mutamix located in central Thanalan (29,20).
All of these design choices, just further cement Ul'dah as the central city (including the Main Storyline which sends everyone over there).