Blizzardâs continued improvements for Diablo IV have introduced many new, mechanics, among them the incredibly useful Tempering. Once you begin collecting powerful gear, particularly Legendary, Unique, and Ancestral-rarity items, Tempering is one of the new major ways youâll push their power even higher. MORE POWER! Hereâs how.
The old mechanic of âupgradingâ items is gone, so you wonât get uninteresting and minor stat upgrades anymore. Instead, Tempering is a less powerful, less expensive version of the Legendary Affix system, which lets you add unique combat or ability modifiers to your items. And, unlike the Legendary Affix system, you can Temper lower rarity items, too.
How To Temper Your Equipment

To get started, head to the Blacksmith. Click on the fourth tab, identified with the lone anvil, and the Tempering menu will highlight a square into which you can drag and drop an item.

Doing so will highlight which types of tempering are available to you.
Weapons
Offensive
Defensive
Utility
Mobility
Resource
While there are six overall categories, they are limited by item slot. For example, if you want to enhance a weapon, youâll choose between the Weapons and Offensive options. You canât choose the exact buff you want (this is Diablo). These are simply pools that determine which random buff youâll get by Tempering.

The Offensive pool contains several generic pools that are available for every class, with options like: âIncrease Damage By 16 percent to 20 percent,â and, âDeal 50 to 70 percent more Ultimate damage,â along with a few class-specific options.
The Spiritborn, for example, has various Tempering recipes that can be used to enhance specific Class Abilities, or even entire Class Ability Types (check out the Spiritborn class guide for more information). Say if you use many Jaguar abilities, using the âJaguar Finesseâ Tempering pool will give you a random bonus to something you use as a Jaguar Spiritborn, for example Jaguar Damage, Mystic Circle Potency, etc.

Once you choose, it will show you the Material Cost (you gain materials by Salvaging unwanted items at the Blacksmith). Click âTemper Itemâ and your item will get a randomly selected bonus from the chosen pool.
What If I Donât Like My Bonus?

If you didnât want the item bonus you got, you are in luck: you can Temper again to ârerollâ and see if you get a better bonus. There are limits to this, however. You can only reroll five times total. Donât worry, though, the Blacksmith keeps track of how many times your item has been rerolled, and it will show you before you spend your resources.
How To Get More Tempering Options

If you want to expand your options, justâŠplay the game. Tempering recipes can drop from enemies, just like other loot types. Use them (right click, if you are using mouse and keyboard) in your inventory to add them to your Blacksmith âTemperingâ menu, then youâll be able to select from new bonus pools the next time you Temper an item.
With this system, youâre able to tailor random drops far better to suit your specific build, and to improve any dodgy stats they may come with. No more sighing and selling!