Seggrit is a merchant in Haven. You can access his shop after you have completed the tutorial and the Inquisition has been formed. He will tell you that he has remained in town as his wares were destroyed by demons and this is an opportunity to rebuild and maybe help the efforts of the Inquisition.
Seggrit's Shop becomes available once you reach Haven and is located to the right of the front entrance.
Seggrit's Shop
Weapons

Common Maul
DPS: 85
Cost: 66

Common Lightning Staff
DPS: 32
Cost: 66

Common Bow
DPS: 49
Cost: 53

Common Axe
DPS: 76
Cost: 32

Common Shield
Armor: 8
Cost: 26

Common Dagger
DPS: 100
Cost: 26
Armor

Common Heavy Armor
Armor: 67
Cost: 90

Common Medium Armor
Armor: 73
Cost: 90

Common Light Armor
Armor: 62
Cost: 90

Common Vitaar
Armor: 5
Cost: 13

Common Helmet
Armor: 12
Cost: 13

Common Helmet
Armor: 10
Cost: 13

Common Helmet
Armor: 11
Cost: 13
Upgrades

Rare Bianca Aiming Module
Bonus: +3% Critical Chance
Cost: 28

Rare Bianca Arms
Bonus: +5 Damage
+6% Attack
+12% Critical Damage Bonus
Cost: 19

Rare Bianca Grip
Bonus: +3 Cunning
Cost: 28
Schematics

Tier 1 Bianca Aiming Module Schematic
Cost: 20

Tier 1 Bianca Arms Schematic
Cost: 20

Tier 1 Bianca Grip Schematic
Cost: 20