The Kanai's Cube recipe is called Curiosity of Lorath Nahr, with a bit of flavor text reading: Once unlocked, you will be able to upgrade any non-crafted Legendary item to Ancient Primal quality by spending Primordial Ashes. 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. Upgrade Legendary to Primal in Diablo 3 Season 28: Materials Cost Upgrade any non-crafted Legendary item to Primal Ancient quality. Update on : We've updated this article with new details on upgrading Legendary items to Primal in Diablo 3 Season 28 Rites of Sanctuary. 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. 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!
In Diablo 3 Season 28, aka Rites of Sanctuary, there's the Altar of Rites feature, a plethora of balance changes, and more. Blizzard isn't pulling any punches with Diablo 3 Season 28, as the last season before the release of Diablo 4.