WoW Upgrades - The Item Upgrader
Upgrades give a guaranteed boost to certain stats. official website by +3. A random extra substat is also boosted alongside every upgrade.
Upgraded gear generally sees higher trade value as long as it meets low requirements (like the FB sorc's shield) or a very high stat variation (like eth titan weapons). Upgrades aren't as important for the latter due to the need to roll an exact version.
Recycle Points

The item upgrader allows players to upgrade their gear by offering the currency to an NPC. Upgrades can be applied to any type of armor or weapons. The item used to upgrade the item will be consumed and can't be used again. Upgrades can also be used to create the enchantments.
You can upgrade your gear at any time by visiting the upgrader in any major city. It is recommended to visit the upgrader every few weeks to keep your equipment up to date.
The cost of upgrading will be based on the current item level of the equipment being upgraded, but will always be cheaper than purchasing new gear from other sources. Upgrades like upgrading a Benthic chest up to ilvl385 will cost you 20 recycle points. Buying a similar item will cost you 105.
Valorstones
Upgrades are items that can be used to upgrade weapon, armor, tool and accessory upgrades. They can be purchased through NPCs who sell upgrades to item owners in a variety of currencies. They can also find them in random treasure lists. Once purchased, an upgrade is able to be used on any weapon, tool or armor. button, which will show an item's preview at its next upgrade level when the player has enough materials.
The cost of upgrading varies based on the item slot, and the current item level. For instance weapons cost more than gloves, bracers, or bracers. Each upgrade cost 15 Flightstones plus a certain number of crests. Certain upgrades provide discounts on Flightstones. Once an item is upgraded to a certain degree, it can be downgraded and sold to the upgrader at a lower price.
Upgraders for items can be found in many places on the main island and some outposts. The NPCs offer both an upgrade coupon and a possibility of obtaining a new recipe. The discount on upgrades increases according to the number of items that are being upgraded, and can be increased by having players complete some specific achievements or quests.
Icewind Dale does not have an item upgrader at the start unlike Cromwell from Baldur's gate II. The NPCs that can assist with upgrades are only accessible through a variety means. This is both a benefit as well as a drawback.
In Season 3, a number of new features were added to the upgrade system. When a player has an upgrade to a certain level for an item in an armor slot, upgrading additional items to that same item level will cost less, even in the event that they are part of another set of gear.
The discount is applicable to all accounts. The amount of Harbinger Crests needed to upgrade is reduced also, but is only available when certain milestones have been reached.
Crests
When it comes to upgrading equipment in WoW, players have a variety of options. Flightstones are a currency that is available to all players for upgrading. Crests are more special, and are used during specific level upgrades for items. Crests are an important part of the Dragonflight Gear Progression System introduced in version 10.1. They come in four ranks.
The first thing to be aware of is that crests can only be used to purchase equipment that is of a particular rank, and every rank has different requirements for its upgrade path. The simplest and most straightforward upgrade path costs 15 crests, while the more complex one can require as much as 20 crests, based on the type of gear being upgraded.
Players can earn crests by working through content at the appropriate level. This could be done by doing outdoor activities or completing dungeons and raids in any difficulty to earn lower-tier gear or Mythic+ raid bosses or dungeons that have a high difficulty for endgame gear. The crests can then be exchanged with an item upgrader, such as Cuzolth or Vaskarn in Valdrakken to upgrade the item in the proper steps and pathways.
The new currency system isn't too difficult to use, but it will bring some modifications to the upgrade process. When a piece of equipment reaches the highest level of upgrade for any rank (Explorer or Adventurer) it is no longer required to purchase Flightstones. This change allows players to upgrade their gear to the highest possible ilvl on all their characters instead of relying on seasonal loot.
It's also essential to use crests with care, since they are only used for one purpose. It is best to put your Whelpling-rank Crests on the top-quality equipment you can find and save Drake and Wyrm Crests to be used for the next set of upgrades. This is especially true for items such as trinkets and rings that fill multiple slots. The account-wide discount will only be applicable if all the slots on the character are filled with top-quality equipment.