Diablo 4 Horadric Cube Guide: Mythic Upgrades, Rerolls, and Recipes

Updated September 16, 2026: Diablo 4 Season 15 adds three major Horadric Cube recipes: upgrade any Unique directly into its Mythic version while keeping all affixes, reroll base affix values on gear, and reroll Charms and Seals. These recipes give players more control over endgame crafting than any prior season.

By Indie Kings | September 16, 2026

Upgrade Direct Item to Mythic
Affix Value Reroll
Horadric Reroll for Charms and Seals
Blacksmith and Jeweler Mythic Caches
Frequently Asked Questions
Bottom Line

1. Upgrade Direct Item to Mythic

The headline recipe in Season 15 lets you take a Unique item and turn it directly into its Mythic version. Per Duskforge's September 14 coverage, the upgrade preserves your existing affixes, Tempering, and Masterworking, meaning a well-rolled Tibault's Will stays well-rolled after becoming a Mythic.

The tradeoff is significant: this Cube recipe is more expensive than crafting a Mythic through the Blacksmith or Jeweler, and it only works on items that are not Unmodifiable. Mythics created through this recipe also receive a Crafted tag, which limits you to equipping one Crafted-tag Mythic across your entire gear set.

Mythics made through the Blacksmith, Jeweler, or normal drops do not receive the Crafted tag, so you can mix methods to equip multiple Mythics in a single build. The strategy, per Duskforge, is to save the Cube upgrade for your most important Mythic and fill the remaining slots with Blacksmith or Jeweler Mythics.

2. Affix Value Reroll

The Affix Value Reroll recipe lets you reroll all of an item's base affix values without destroying the investments you have already made. Per Duskforge, Greater Affixes, Enchanted affixes, Tempers, Masterworking, and Transfigurations are all protected, as long as the Transfigured item is still modifiable.

This changes the risk calculus for improving gear. A piece of equipment with great Greater Affixes and Tempering but poor base affix values can now be rerolled without scrapping the entire item. For any player who has spent hours building toward a perfect item, this recipe removes the fear of losing that progress to a single bad reroll.

3. Horadric Reroll for Charms and Seals

The Horadric Reroll recipe applies specifically to Charms and Seals, giving those items their own dedicated reroll path separate from gear. Per Duskforge, this recipe follows the same protection logic: the reroll targets base properties while preserving investments already made.

Charms and Seals have become a larger part of the Season 15 build process, and this recipe ensures you can continue refining them without starting from scratch each time.

4. Blacksmith and Jeweler Mythic Caches

Beyond the Cube, Season 15 introduces two Blacksmith caches: a Mythic Unique Cache that rolls for class-appropriate Mythics, and an Iconic Mythic Cache that rolls specifically for Iconic Mythics. Both cost the same, per Duskforge's coverage.

The Jeweler still offers Rune Crafting: spend Resplendent Sparks and Runes to choose a gear slot and receive a random class-specific Mythic Unique from that slot. None of these non-Cube methods apply the Crafted tag, so they remain viable options for filling out your Mythic collection.

Crafting Method	Crafted Tag?	What You Get
Horadric Cube: Upgrade Direct Item to Mythic	Yes (1 per character)	Specific Mythic from your Unique, preserving affixes and investment
Blacksmith: Mythic Unique Cache	No	Random class-appropriate Mythic Unique
Blacksmith: Iconic Mythic Cache	No	Random Iconic Mythic specifically
Jeweler: Rune Crafting	No	Random Mythic for chosen gear slot

5. Frequently Asked Questions

What does the Horadric Cube's Mythic upgrade cost?

The exact material cost varies by item, but Duskforge reports it is more expensive than the Blacksmith or Jeweler options. You need a modifiable Unique with the affixes you want to preserve.

Can I equip multiple Cube-upgraded Mythics?

No. Cube-upgraded Mythics receive a Crafted tag, and you can only equip one Crafted-tag Mythic at a time. Mythics from other sources do not carry the tag.

What does the Affix Value Reroll protect?

Greater Affixes, Enchanted affixes, Tempers, Masterworking, and Transfigurations are all preserved during the reroll. Only base affix values change.

Does the Horadric Reroll work on gear?

No. The Horadric Reroll recipe is for Charms and Seals only.

Can I still get Iconic Mythics this season?

Yes. The Blacksmith now has a dedicated Iconic Mythic Cache specifically for Iconic Mythics. The PTR had removed this targeted option, but Blizzard restored it for the live season after player feedback.

How many Mythics can I equip in Season 15?

You can equip multiple Mythics, but only one can come from the Horadric Cube's upgrade recipe. Fill the rest with Blacksmith, Jeweler, or natural drops to bypass the Crafted tag restriction.

Bottom Line

The Horadric Cube in Season 15 is the most versatile crafting tool Diablo 4 has ever had. The direct Unique-to-Mythic upgrade gives deterministic control over your most important item, the Affix Value Reroll protects your gear investments, and the Horadric Reroll brings Charms and Seals into the crafting loop.