With the coming of patch 3.0 we can now level up our characters.
The higher our level, the more items we can buy from the trader.
Levels are persistent between deaths.
To gain XP you can do the following:
To see your level interact with any NPC in the Trader Zone and look to the top right.
The higher your characters level, the more items the trader will sell you.
Each Trader level requires our character to be a specific level.
Think of Trader Loyalty Levels, like the old Weapon Tiers in patch 2.5.
Character Level 03, unlocks Loyalty level 1 items.
Character Level 10, unlocks Loyalty level 2 items.
Character Level 25, unlocks Loyalty level 3 items.
To see what you need to unlock the next Loyalty level with the Traders, interact with any of them and look at the top right.