Diablo 4 Guide: Convert Any Unique to Mythic with Horadric Cube
If you’ve been hunting upgrades in Diablo 4, the path to Mythic gear is finally clearer—but it still comes with a major “don’t mess this up” warning. In Diablo 4, any Unique item can be converted into a Mythic Unique using the Horadric Cube, as long as you meet the prerequisites. The catch is that the option won’t show up until you’ve reached Torment 1, which effectively means you’ll need to hit level 70 and clear a Pinnacle Dungeon first. After that, the actual conversion requires five Pandemonium Fragments, a crafting material tied specifically to defeating the Corrupted Reaper boss.
Upgrade to Mythic Unique: the exact requirements
- Reach at least Torment 1 difficulty
- Obtain 5 Pandemonium Fragments
- Get a Unique item
- Go to the Horadric Cube
- Select the Upgrade to Mythic option
Once you’re in any Torment difficulty tier, the Horadric Cube will add an “Upgrade to Mythic” recipe to its list. Unlike other cube crafts, this one doesn’t use any magic dust. Instead, you’ll need five Pandemonium Fragments, which are guaranteed to drop when you beat the Corrupted Reaper boss. You can find that boss in Zarbinzet.
The Corrupted Reaper fight depends on hoard access: you’ll need Superior Lair Keys to open the hoard where the boss is. That means you may have to gamble a bit during normal Lair Boss farming, because Belial must spawn for the Corrupted Reaper to appear. If you don’t want to rely entirely on random spawns, you can also pick up a few Superior Lair Keys by completing seasonal challenges.
There’s a second route to Mythic Uniques, but it’s not as direct. You can also craft random Mythic Uniques by visiting a Jeweler, which requires Resplendent Sparks and specific Rune combinations.
IMPORTANT: The “Upgrade to Mythic” label can mislead. The recipe description suggests it will transmute a Unique into a random Mythic Unique that matches the same equipment slot. In practice, it doesn’t truly upgrade your existing item—it replaces it. Because of that, if you already own a perfectly rolled Unique that you’re built around, you should avoid using the Upgrade to Mythic option on it, or you risk bricking your setup.
Why this matters for players: Mythic conversion is slot-locked replacement, not a reroll
The practical impact of this system is that your choice of target matters as much as your farming efficiency. The recipe is Torment-gated, Fragment-gated, and it ultimately converts your chosen Unique into a new Mythic Unique from a pool tied to the item slot. That’s a big difference from typical “upgrade” expectations, where players often assume they’re improving the same item’s stats. Here, you’re gambling that the resulting Mythic roll will better serve your build than what you currently have.
- The cube option only becomes available after you reach Torment 1.
- You’ll need five Pandemonium Fragments, which drop reliably from Corrupted Reaper.
- Access requires Superior Lair Keys, and Corrupted Reaper availability is tied to Belial spawning during Lair Boss attempts.
- The Horadric Cube recipe is a transmutation into a random Mythic for the same slot, not an upgrade of your exact item.
- Using it on a near-perfect Unique can damage or completely disrupt a build.
What changed with Mythic Uniques in Season of Undeath Awakening
Mythic gear didn’t always work this way. Season of Undeath Awakening reworked Mythic Unique items in Diablo 4. Previously, only a limited set of items counted as Mythic Uniques. Now, “Mythic” is a rarity tier that can apply to all Unique items in the game. The result is that every Unique item now has a chance to drop as a Mythic Unique, while the older Mythic items were reassigned into regular Unique status.
Mythic versions of Unique items come with three standout properties:
- Their unique powers and effects are 30% stronger than the standard version.
- All affixes roll at the highest possible value, including the item’s unique effect.
- Mythic Uniques are always Ancestral.
Loadout rules also matter. Players can equip only one crafted Mythic item. However, if Mythic Uniques drop naturally, you can equip as many as you want.
