Kel, a merchant in Cahlabrok, got his eyes on a certain lady, is in need of a courier to do some deliveries. Do as he asks. Go along with it. Then let curiosity get the better of you, and become a savior.

Then you recieve an item that will change your wardrobe forever.









Enjoy your achievement I guess.
Also, various merchants and their special deals listed below as I find them.

(Western Cahlabrok)
Potion of Proficiency (4.5k)
Type: Potion
Effect: +1 Ability Point

(Central Cahlabrok, Topmost)
Blackened Highmage's Robe of the Abyss (11k)
Type: Armor
Requirement: Int 6, Wil 6
Armor: 10, 10, 15, 5
Effect: Black & Demon Magic ability cooldowns -20%, Black & Demon Magic ability costs -20%

Light Assault Helmet (6.5k)
Type: Helmet
Requirement: Con 3
Armor: 4, 4, 4, 4
Effect: If health is above 90%, Empowered(+25% attack damage, +25% power multiplier for all abilities)

Blackened Highmage's Cap (6.5k)
Type: Helmet
Requirement: Int 6, Wil 6
Armor: 2, 2, 2, 2
Effect: +7 Focus, +0.25 focus per second

(Central Cahlabrok, Middle)
Sanguine Hemorrhage (15k)
Type: 1h Axe
Requirement: Str 7
Effect: When landing a critical hit; Apply Weakened for 5sec & Apply Bleeding for unlimited time
Note: Yes. You read that right. If it bleeds, it will bleed until death.

Deceiving Bow (13k)
Type: Bow
Requirement: Dex 6
Effect: +25% Damage VS Wildlife, When landing a critical hit; instantly kill if below 10% max health

Sapping Axe (7.3k)
Type: 1h Axe
Requirement: Str 5
Effect: When landing a critical hit; Apply Weakened and Enfeebled for 5sec

Deceiving Dagger (4.5k)
Type: Dagger
Requirement: Dex 5
Effect: When landing a critical hit; Apply Bleeding for 5sec and instantly kill if below 10% of max health

(Central Cahlabrok, Bottom)
Demonic Necklace (8.5k)
Type: Amulet
Requirement: N/A
Effect: Demonic Magic ability cooldowns -20%, Demonic Magic ability costs -20%

Blackened Necklace of the Abyss (8.5k)
Type: Amulet
Requirement: N/A
Effect: Black Magic ability cooldowns -20%, Black Magic ability costs -20%

Dark Elven Blueprints(Epic, 4250): Strider, Nor's Emissary, Harvester, Citadel, Farm(III)
Dark Elven Blueprints(Rare, 2125): Border Fortress

Arcane Highmage's Cap
Type: Helmet
Requirement: Int 6, Wil 6
Armor: 2, 2, 2, 2
Effect: +7 Focus, +0.25 focus per second

Arcane Highmage's Robe
Type: Armor
Requirement: Int 6, Wil 6
Armor: 10, 10, 15, 5
Effect: Arcane Magic ability cooldowns -20%, Arcane Magic ability costs -20%

(North Bridge)
No special deals! What a disappointment!

(Market, Bottom)
Parry Shield (8.1k)
Type: Shield
Requirement: Dex 5
Block: 20%
Effect: When you block; get COMBAT FOCUS for 5sec
Note: Combat Focus = +100% Critical hit chance

Heavy Helmet of Regeneration (6.7k)
Type: Helmet
Requirement: Con 7
Armor: 8, 8, 8, 8
Effect: Once per 60sec when taking damage; Apply REGENERATING for 4sec
Note: +101 health per second

(Market, Middle)
Revitalizing Battlestaff (13k)
Type: Staff
Requirement: Dex 7
Effect: When blocking; heal for 101 health, When landing a critical hit; Knockback 20 + stun for 1-2sec

Draconid Greathammer (13k)
Type: 2h Mace
Requirement: Str 7
Effect: +50% Damage VS Golems, When landing a critical hit; Instantly kill FROZEN targets, Every hit: Bonus Strike damage against enemy creatures around target
Note: EXPLOSION HAMMER! The explosion damage scales with SOMETHING, but I am not sure what. It dealt 206 damage with 5 Str/2 Dex/1 Int/4 Wil. It dealt 222 damage with 4 Str/6 Dex/1 Int/1 Wil. It dealt 285 damage with... 1 Str/1 Dex/10 Int/8 Wil. And my 1 Str/1 Dex/11 Int/2 Wil battlemage had it dealing 335 explosion damage.

(Market, Top)
Priest's Charm ()
Type: Amulet
Requirement: N/A
Effect: Light Magic ability costs -20%, Light Magic ability cooldowns -20%

Dwarven Epic Blueprints(4250): Berserker, Pyromancer, Warhorn, Moonsilver Mine, Moonsilver Smeltery, Fortified Watchtower, Citadel, Border Fortress

(North Market, Right)
Human Epic Blueprints(4250): Aria Collector, Market Place, Bastion Tower, Citadel, Frontier Fortress, Champion, Flag Bearer, Mentalist

(North Market, Left)
Absolutely nothing!

(South Market, Center)
Elemental Highmage's Cap (6.5k)
Type: Helmet
Requirement: Int 6, Wil 6
Armor: 2, 2, 2, 2
Effect: +7 Focus, +0.25 focus per second

Potion of Fresh Start (1.7k each, 10 in total)
Type: Potion
Effect: Resets Attribute & Ability points for respecialization

Consumeables: 12x Vortex Flask(Area pull), 12x Nullifying Flask(Area purge + SILENCE for 10sec)

(Southwest Market, Top)
Reckless Frenzy (21k)
Type: 2h Axe
Requirement: Str 9
Effect: +50% Damage VS Draconids, every auto-attack increases attack speed, When landing a critical hit; applies WEAKENED for 5sec.
Notes: This thing didn't look like anything special until I noticed the part about incremental attack speed. Neato. Give it to a Combat Arts character and go to town to cleave everything.

Beastslayer's Greatsword (13k)
Type: 2h Sword
Requirement: Str 5, Dex 3 (Scales with Str)
Effect: +100% Damage VS Wildlife, +100% Damage VS Draconids, when landing a critical hit; apply ENFEEBLED for 5sec

Taunting Club (7.3k)
Type: 1h Mace
Requirement: Str 6
Effect: +50% Damage VS Golems, on hit; Taunts enemy for 5sec.
Note: No more will the big bad randomly meander towards your squishy backline despite the three angry heromans slapping its ♥♥♥♥ in melee!

Deathly Chill (7.3k)
Type: 1h Spear
Requirement: Dex 5
Effect: Deals Pierce/Magic Damage. +100% Damage VS Fire Creatures. 5% chance on attacking to apply FROZEN for 5sec. When landing a critical hit; apply BLEEDING for 5sec.

(Southwest Market, Bottom)
Archon's Shield ()
Type: Shield
Requirement: Str 5
Block: 20%
Effect: When blocking; restore 10~ focus

Cleansing Helmet (6.6k)
Type: Helmet
Requirement: Con 5
Armor: 6, 6, 6, 6
Effect: Once every 60 seconds when gaining an Affliction; CLEANSE all Afflictions and gain IMMUNE TO AFFLICTIONS for 10sec.

(Southeast Market, Top)
Winter's Greataxe (13k)
Type: 2h Axe
Requirement: Str 7
Effect: Deals Strike/Magic Damage. +50% Damage VS Draconids, +100% Damage VS Fire Creatures. On hit; 5% chance to apply FROZEN for 5sec. When landing a critical hit; apply WEAKENED for 5sec.

Dwarven Epic Blueprints(4250): Berserker, Pyromancer, Warhorn, Moonsilver Mine, Moonsilver Smeltery, Fortified Watchtower, Citadel, Border Fortress.

(Southeast Market, Bot)
Skull Knight's Skull Helmet (6.7k)
Type: Helmet
Requirement: Con 7
Armor: 8, 8, 8, 8
Effect: On killing an enemy; heals user for 40-50 health

Dark Elf Epic Blueprints(4250): Citadel, Farm(III), Strider, Nor's Emissary, Harvester
Dark Elf Rare Blueprints(2125): Border Fortress

(Central swamp, on bridges)
Weakening Tribe Sword (7.3k)
Type: 1h Sword
Requirement: Str 3, Dex 3 (Dextery Scaling)
Effect: Deals Pierce/Strike Damage. When landing a critical hit; apply WEAKENED for 5sec

Heavy Berserker Helmet (6.7k)
Type: Helmet
Requirement: Con 9
Armor: 10, 10, 10, 10
Effect: If health is below 40% of max; gain HEAVY BERSERKER HELMET(+30% movement speed, +42% attack speed)

(Location)
Name
Type:
Requirement:
Armor:
Effect:

(Eastern edge of the map, just north-east of the south-eastmost Godstone)
Information provided by Marcos_DS in the comments, thank you!
Draconic Greataxe (12.5k)
Type: 2h Axe
Requirement: Str 7
Effect: +50% damage vs Draconic, On crit: Weakened 5sec, +182 slash damage vs. enemies around target
Note: Can deal much more area damage, as my Combat/Evocation battlemage had the tooltip saying 333 slash damage around target.