Dark Souls 2 Merchant Info

Be wary of spoilers

Courtesy of Anonymous in thread

Maughlin The Armorer:
Located in: Majula
Spend 1000 souls: Royal Solider Armor and Elite Armor Spend 16000 souls: Alva's Armor
After spending 16000 souls if you talk to him with zero souls in your inventory and you are undead he will give you Armor of Aurous
Boss armor: Defeat these bosses and he will have them in the inventory:
Smelter Demon Armor
Looking Glass Knight Armor
Lost Sinner Armor
Throne Defender Armor
Throne Watcher Armor
Lastly he sells the Moon Butterfly armor set if you defeat all the bosses in New game +1 and New game +2

Sweet Shalquoir:
Located in: Majula
Flying Feline Boots: clear Brighstone Cove Tseldora
Unlimited: Prism Stones, Alluring Skulls, Llyod's Talisman's, and Homeward Bones after opening The Shrine of Winter

Blacksmith Lenigrast:
Located in: Majula
Sells basic weapons and limited titanite shards.
Doesn't update like most of the others but will give you a hammer if you spend 8000 souls on him.

Merchant Hag Melentia:
Located in: The Forest of Fallen Giants, exhaust all conversation options and she will move to Majula.
Agdayne's Armor: Kill Warden Agdayne
Creighton's Armor: Kill Creighton
Benhart's Armor: Kill Benhart
Pate's Armor and Weapons: Kill Pate
Cales Armor: Kill Cale
Lucatiel's Armor and Weapons: Kill Lucatiel
Black Armor Set: Kill Straid of Olaphis
Saints Armor: Kill Licia of Lindeelt
Hexer armor: Kill Felkin The Hexer
Chaos Set: Kill Navlaan
Targray's Armor: Kill Blue Sentienl Targray
Unlimited Life Gems: Exhaust her dialouge opitions in the forest of the giants and she will move to Majula.
Radiant Lifegem: Added to inventory after clearing The Lost Bastile, not infinite.
Gives: Coveteous Silver Servant Ring +1: Spend 10,000 Souls on her then talk to her.

Stone Trader Chloanne:
Located in: Harvest Valley, exhaust all conversation options and she will move to Majula.
Unlimited Titanite Shard: Clear Iron Keep
Unlimited Large Titanite Shard: Clear Drangleic Castle
Unlimited Titanite Chunks: Added to inventory after clearing The Undead Crypt, infinite after defeating the final boss.

Steady Hand McDuff:
Located in: The Lost Bastille, this is a permanent location. You have to blow up the wall near him (Near where the guy rolls the barrel down. Use Firebombs
All weapons and shields he sells become unlimited in New Game +

Lonesome Gavlan:
Located in: Talk to him in no-mans wharf, harvest valley and he will permanently move to The Doors Of Pharros he then sells unlimited Poison Moss, Rotten Pine resin, poison throwing knives, and poison arrows.

Cromwell The Pardoner:
Located in: Located in Brightstone Cove Tseldora in the Chapel. Their is a ladder to the right of the exit of the building it's well hidden.
Sells everything right off the bat and does not expand.
Gives: Ring of Resistance if your Faith is 35 or Higher.

Carhillion Of The Fold:
Located in: No Man's Wharf, after talking to him and killing the Flexile Sentry he will move to Majula.
Spells: Sells unlimited spells after passing through the Shrine of Winter
Gives: Northern Ritual Band +1 if your intelligence is 30 or more.

Laddersmith Gilligan:
Located in: Earthen Peak, buy his ladder or defeat the Boss and he will move to Majula.
Sells unlimited Stock by default

Straid of Olaphis:
Located in: The Lost Bastille near the belfry bonfire (servants one) you need a Fragrant Branch of Yore to un-petrify him.
Great Lightning spear and Sunlight blade are sold after clearing the Undead Crypt
Trade Boss souls to him to unlock unique weapons, the boss souls he takes are:
The Last Giant
The Pursuer
DragonRider
Flexile Sentry
Executioner Chariot
Skeleton Lord
Covetous Demon
Mytha, The Baneful Queen
Smelter Demon's Soul
Demon of Song
Belfry Gargoyle
Ruin Sentinel
Scorpioness Najka
Royal Rat Vanguard and Authority
Velstadt
Giant Lord
Darklurker
Old Witch, Old King, Old Dead One and Old Paledrake Soul Only give their weapons or spells in new game+
Gives: His armor after trading him four boss souls.

Licia of Lindelt
Located in: Heide's Tower of Flame, then after exhausting all her dialogue moves in the area connecting Majula and Heide's Tower.
Unlimited Spells after passing through The Shrine of Winter (So pass through it lol)

Felkin The Outcast:
Located in: Huntsman's Copse sitting in a chair near the very beginning.
Requires a certain level (apparently 10 each) of int and faith to access his wares.
Gives: His Hex Set when your Intelligence and Faith is 20 or higher

Vengarl of Forossa:
Shaded Woods, very easy to miss his as he only has his head. In the woods if you hang to left in the big fogged area you'll enter an area with a stack of stones. In the rubble his head is there.
Expands his ware to include his Red Rust Items after you defeat his body.
Gives: His helmet after exhausting all conversation with him.

Weaponsmith Ornifex:
Located in: Shaded Ruins, you have to un petrify the lion solider near the acid cave to get the Fang Key. Use it on the locked door AND DO NOT ATTACK HER SHE LOOKS LIKE THE CROW DEMON FROM THE LAST GAME. She then after talking to her moves to her permanent location inBrightstone Cove Tseldora.
Sells unlimited Items except for amber Herbs and Green blossoms that become unlimited after defeating Nashandra
Trading these boss souls will give you weapons:
Old Dragonslayer
Lost Sinner
Old King
Duke's Dear Freja
Looking Glass Knight
Velstadt
Souls of the King
Guardian Dragon Souls
Ancient Dragon Soul
Throne Defender and Throne Watcher
Old Witch, Old King, Old Dead One and Old Paledrake Soul

Chancellor Wellager:
Located in: Drangleic Castle, this is a permanent location.
Sells unlimited right off the bat, but expands upon beating the Looking Glass Knight. And expands again with new spells after you beat the Looking Glass Knight and the final boss in new Game +++
Gives: Royal Dirk, Espada Ropera after defeating the Giant Lord. You have to talk to him.

Royal Sorcerer Navlaan:
Located in: Aldia's keep. Talk to him while hollowed and human for different responses. Only talking to him hallowed sets up the assassination quests though.
Sells unlimited Greatarrows off the bat:
Gives: dispelling ring, simpleton's Spice, Forbidden Sun, Unleash Magic and finally gives his armor set after completing all of his assassination requests.

Grave Warden Agdayne:
Located in: Undead Crypt, does not move.
Sells everything off the bat, does not expand.
Gives: his armor set after talking to him after obtaining the King's Ring.