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Diablo 4 Season 4is the start of a whole new Diablo 4 endgame for both Seasonal and Eternal Realms.
Based on community feedback, the huge itemization update in Patch 1.4.0 brings two new endgame crafting systems.

Diablo 4 Tempering before and after(Image credit: Blizzard Entertainment)
Here’s everything it’s crucial that you know about this new crafting system.
What is Tempering in Diablo 4?
Tempering manuals will give you more customization for your character and skills.

Diablo 4 Tempering before and after(Image credit: Blizzard Entertainment)
Tempering is a way to add meaningful and fun affixes to your (non-Unique) items.
Overly specific conditional modifiers have been removed, for example ‘Damage to Injured Enemies."
You’ll only see affixes that impact your build positively and with a higher uptime.

Diablo 4 tempering before and after(Image credit: Blizzard Entertainment)
If you combine a certain Temper Manual with an item, it will add one of 4 affixes randomly.
What is a Temper Manual?
Profane Innovation is aUtilitymanual (so same as the Codex of Power categories for Legendary affixes).

You’ll need a Temper manual to complete Tempering at the Blacksmith
Tempering Durability
You cannot Temper an item indefinitely.
Players won’t be able to add Tempered Affixes to Unique and Uber Unique Items.
All Tempering Manuals
What is the difference between Tempering and Masterworking?

There is a 1 in 5 chance to increase the size of Corpse Explosion using this Tempering manual
















