Stock rarity, refresh cost and shared merchant progression.
The three vendor levels sell Common, then Rare, then Special equipment. Unique gear is excluded. Level upgrades cost 10 and 15 Echo Shards.
Stock is published as three items per unlocked rarity, drawn from weapons, armour and artifacts. Natural refresh is every 30 minutes; the detailed merchant page distinguishes free refresh charges from three-shard paid refreshes.
Availability depends on quest progress and town. The map retains each location's published condition; a marker is not proof the vendor is unlocked in your save.
Set your hero and unlocks → · Open related calculations and evidence →
Published source · Wikily · Numerical facts and original explanatory summaries. Not independently tested in game. Unknown formulas remain unknown.