Weaponsmith Ornifex

Weaponsmith Ornifex is a merchant found in Dark Souls II. She appears to be a Crow Demon. She will sell you boss soul weapons in turn for a boss soul and a certain amount of souls.

Location
Found in a cage underground in the Shaded Ruins. She is freed using the Fang Key.

Boss Soul Weapons

 * Butcher's Knife - Soul of the Rotten + 5,000
 * Curved Dragon Greatsword - Ancient Dragon Souls + 1,500
 * Drakewing Ultra Greatsword - Guardian Dragon Soul + 1,500
 * Dragonslayer Spear - Old Dragonslayer's Soul + 1,500
 * Iron King Hammer - Old Iron King Soul + 5,000
 * King's Mirror - Looking Glass Knight Soul + 3,000
 * King's Shield - [Soul of the King]]
 * King's Ultra Greatsword - Soul of the King + 10,000
 * Ruler's Sword - Soul of the King + 10,000
 * Sacred Chime Hammer - Soul of Velstadt
 * Spider Fang - Soul of The Duke's Dear Freja + 1,500
 * Spider's Silk - Soul of The Duke's Dear Freja + 1,500
 * Thorned Greatsword - Looking Glass Knight Soul + 3,000

Weapons

 * Murakumo - 5,800
 * Partizan - 3,000
 * Twinblade - 5,000
 * Composite Bow - 5,500
 * Heavy Crossbow - 4,000

Ammunition

 * Fire Arrow - 60
 * Fire Bolt - 60

Items

 * Amber Herb x10 - 1,600
 * Green Blossom x10 - 1,300
 * Flame Butterfly - 600

Spells

 * Homing Soul Arrow x1 - 6,500
 * Homing Soul Mass x1 - 6,000
 * Fall Control x1 - 4,800