Why We Enjoy Item Upgrade (And You Should, Too!)
WoW Upgrades - The Item Upgrader
Upgrades will give you a boost to specific stats. Each upgrade increases item level by +3. Each upgrade also boosts the random substatus.
Upgraded gear is generally more useful, unless the item is not required by nature (like FB sorc shields) or has a high variance in stats (like the eth Titan weapons). These types of gear get less value from upgrading due to the need to roll for a perfect version.
Recycle Points

The item upgrader lets players upgrade their gear by transferring the currency to an NPC. Upgrades can be applied on any type of weapon or armor. The item used to upgrade the item will be consumed and can't be used again. Upgrades can also be used to create enchantments.
You can upgrade your gear at any time by visiting the upgrader in any major city. To keep your gear current it is recommended that you visit the upgrader each few weeks.
Upgrades will cost more, based on the item level, however, they are always cheaper than purchasing new equipment. Upgrades like upgrading a Benthic chest up to the level of ilvl385 will cost you 20 recycle points. A similar item will cost you 105.
Valorstones
Upgrades are useful items which can be used to level up weapons tools, armor, and other items. They are purchased by players from item upgrader NPCs in exchange for a variety of currencies, and may also be found in random treasure lists. Once an upgrade is purchased it can be applied to any weapon or tool with a The button will display the preview of an item's next upgrade level in the event that there are enough materials.
The cost of upgrading is based on the item slot and current item level, with weapons costing more than gloves or bracers, for example. Each step costs 15 Flightstones and a number of crests, with certain upgrades offering discounts to reduce the cost of Flightstones or the crests used. After an item has been upgraded to a certain degree and is degraded, it can be sold and sold back to the upgrader for a lesser amount of both currency types.
Upgraders for items are available in a variety of locations including the main island, as well as a few outposts. The NPCs provide both an upgrade discount as well as a chance to obtain a new upgrade recipe. The upgrade discount increases as more items are upgraded. upgrade item can also be increased by having players complete certain achievements or quests.
Unlike Cromwell in Baldur's Gate II there is no item upgrader available at the beginning of Icewind Dale. Instead, the NPCs that are available to facilitate upgrades require various methods which is both an improvement but also a drawback.
In Season 3, the upgrade system has been altered a bit, with numerous new features added. After a player has earned an upgrade to a particular item level for a particular armor slot, upgrading additional items to that level will cost less even when they belong to an entirely different set of gear.
The discount applies to all accounts. The amount of Harbinger Crests required for upgrades is reduced as well, but is only available once certain milestones are reached.
Crests
When upgrading gear in WoW players have a few choices. Flightstones are an item that is available to all players for upgrading. Crests are more specialized, and are used during specific upgrades to the level of an item. Crests are an important element of the Dragonflight Gear Progression System, which was introduced in version 10.1. They come in four ranks.
The first thing to note is that crests are only able to be spent on equipment that is of a particular rank, and that every rank has different requirements for its upgrade path. The simplest and simplest upgrade is 15 crests. The most complicated upgrade requires up to 20 crests, based on the type of equipment being upgraded.
Players can earn crests through working through content at the appropriate level. This could be by doing outdoor activities, or by doing dungeons or raids in any difficulty to earn lower-tier gear or Mythicbosses for raids, or dungeons with a heroic difficulty to obtain endgame gear. These crests are then exchanged with an upgrader like Cuzolth or Vaskarn in Valdrakken for the appropriate upgrade steps and paths.
Utilizing these new currencies isn't too difficult however, the system introduces some modifications to the upgrade process. For example, once a piece of equipment reaches the highest level of upgrade for any rank (Explorer, Adventurer, Veteran, Champion, Hero, or Mythic), it won't need Flightstones to be upgraded. This change is designed to allow players to get their gear up to the highest possible ilvl on all their characters, rather than relying solely on seasonal loot.
Another notable modification is that crests have one use, so it's important to use them properly. For instance it's best to use all of your Whelpling-rank crests on the best equipment available and keep Drake and Wyrm crests to use for the next set of upgrades you plan on making. This is especially relevant for trinkets and rings that occupy multiple slots on the character, which can only be eligible to avail the account-wide discount if all of the slots are filled with top-quality equipment.