The process of how to upgrade conduits in WoW: Shadowlands involves collecting Unbound Reality Fragments from Ve'nari.
Conduits are essentially add-ons that allow players to further customize their chosen Soulbinds. They add bonuses that are specific to player character's class and specialization (spec), further organized into three categories: potency, endurance, and finesse. These handle spell power, defense, and extra utility, respectively. Each has spec and Covenant specifics, allowing for a number of combinations.
How to Upgrade Conduits in WoW: Shadowlands
Conduits are easily upgraded via Unbound Reality Fragments purchased from Ve'nari in The Maw. Players must be on at least a Cordial level with Ve'nari and have 2500 Stygia on hand per fragment.
Upgrades are chosen for players at semi-random with the upgrade going to one among the currently lowest ranking in their inventory. The game doesn't distinguish between learned and unlearned Conduits, either, so we recommend clearing out your bags before upgrading.
Stygia can be earned by completing World Quests.