Gowry is a sage found in his shack in CaelidRegion, offering spells and information related to Millicent's quest. His quest is intertwined with Millicent's, and depending on your choices, it can offer unique rewards or tragic endings.

Steps:

1. Meet Gowry:

• Find Gowry's ShackLandmark in CaelidRegion, northeast of the Swamp of AeoniaLandmark.
• Talk to him, and he'll mention Millicent. He sells various spells and Ashes of War.

2. Help Millicent (Part 1):

• Follow Millicent's quest until you reach the Church of the PlagueGrace, East of Gowry's ShackLandmark.
• Exhaust her dialogue.
• Return to Gowry and tell him about the needle you received from Millicent.
• He'll ask you to give it to Nepheli Loux at Roundtable HoldLandmark.

3. Return to Gowry:

• After giving the needle to Nepheli, talk to Gowry again.

* He'll sell you more spells and give you the Bewitching Branch.

4. Help Millicent (Part 2):

• Continue Millicent's quest until you reach the Windmill VillageGrace.
• Defeat Commander O'Neil within the Windmill VillageGrace.
• Use the Bewitching Branch on Millicent to remove the Rot's influence.
• Exhaust her dialogue.

5. Return to Gowry (Optional):

• Return to Gowry and tell him about Millicent's situation.

* He'll give you the Unalloyed Gold Needle.

6. Help Millicent (Part 3):

• Follow Millicent's quest further until you reach Erdtree-Gazing HillGrace.
• Help her fight or stay neutral during her battle with her sisters.

7. Choose a Path:

* Help Millicent: Complete her questline by aiding her in defeating Malenia.

* Rewards: Prosthesis Heirloom, Millicent's Set (upon defeating Malenia)

* Betray Millicent: Invade and defeat her at the end of her questline.

* Rewards: Rotten Winged Sword Insignia, Prosthesis Heirloom

Note: Gowry will die regardless of your choice if you progress enough in Millicent's questline.

Aftermath:

• After Gowry's death, you can loot his shack to find:

* Leinwand Talisman of the Herd

* Gowry's Great Rune

Additional Notes:

• Gowry also sells spells throughout the questline, including Glintstone Stars, Night Shard, Night Maiden's Mist, and Pest Threads.
• His questline unlocks hidden areas like Sellia, Town of SorceryLandmark.