New Diablo 3 Season 28 Kanai's Cube Recipe: Upgrade To Primal Legendary

Blizzard isn't pulling any punches with Diablo 3 Season 28, as the last season before the release of Diablo 4. In Diablo 3 Season 28, aka Rites of Sanctuary, there's the Altar of Rites feature, a plethora of balance changes, and more. One of the most exciting new mechanics is a new Kanai's Cube recipe in Diablo 3, allowing Nephalem to upgrade a Legendary item into a Primal Legendary!

This guide explains exactly what you need to do in order to upgrade a Legendary to a Primal Legendary in Diablo 3 Season 28, including the Kanai's Cube recipe cost and the materials required.

Update on 2 May 2023: We've updated this article with new details on upgrading Legendary items to Primal in Diablo 3 Season 28 Rites of Sanctuary.

Upgrade Legendary to Primal in Diablo 3 Season 28: Materials Cost

Since this is a Kanai's Cube recipe, you will need to get the Kanai's Cube, unlocking it for your seasonal character in Diablo 3 Season 28.

Once unlocked, you will be able to upgrade any non-crafted Legendary item to Ancient Primal quality by spending Primordial Ashes.

The Kanai's Cube recipe is called Curiosity of Lorath Nahr, with a bit of flavor text reading:

I found something disturbing within Kanai's Cube. Everything I thought I knew about our history is, at best, uncertain - from the journal of Lorath Nahr. 

Primal Upgrade Kanai's Cube Recipe:

• 100 Primordial Ashes.
• The non-crafted Legendary item you want to upgrade to Primal.

There are some caveats, however, as only one upgraded Primal Item may be worn at a time, and upgraded Primal Items do not retain the properties of the Legendary Item that was used. New affixes are rolled for all upgraded Primal Items.

Get More Primordial Ashes in Diablo 3 S28

We have a complete guide to farming Primordial Ashes quickly in Diablo 3 Season 28. Since these are required to upgrade a Legendary to a Primal Legendary. In short, you will need to get Primal Legendary items and salvage them at the Blacksmith  for 55 Primordial Ashes.

We suggest running Solo Greater Rifts on the highest level you feel comfortable finishing quickly, and just keep grinding and grinding. Remember, you will also need  340 Primordial Ashes in total to unlock all three Legendary Potion Powers during the season. 

Check out YouTuber J_Macc's video showcasing the new Kanai's Cube recipe in action, crafting Ancient Primal Puzzle Rings.

So there you have it, a way to upgrade a Legendary item to a Primal Ancient Legendary in Diablo 3 Season 28, and how you can get more of the materials required for this Kanai's Cube recipe. We will endeavor to update this article if any more information or tricks become available.