Gowry Questline — Step-by-step

Speak to Gowry and agree to help Millicent.
📍 Gowry's Shack
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Defeat Commander O'Neil and obtain the Unalloyed Gold Needle.
📍 Swamps of Aeonia
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Give Gowry the Unalloyed Gold Needle and receive Sellia's Secret.
📍 Gowry's Shack
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Light the flames atop the three towers to break the magic seals.
📍 Sellia Town of Sorcery
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Return after reloading the area and retrieve the repaired Unalloyed Gold Needle.
📍 Gowry's Shack
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Give Millicent the Unalloyed Gold Needle.
📍 Church of the Plague
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Tell Gowry you helped Millicent and unlock his sorcery shop.
📍 Gowry's Shack
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Gowry Find the NPC who gives Millicent’s questline and follow the connection.

Elden Ring: Full Millicent Questline (Complete Guide) - All Choices, Endings, and Rewards Explained — Its Shatter · via YouTube