With the release of Patch 1.3.0a, the gameplay in Diablo 4 Season 3 has undergone many changes, and Igneous Cores is one of them. With these rare consumables, players can activate the Corrupted Altar to enter the Vault of the Loom and challenge Uber Malphas. Previously, players had to use Pearls of Warding, but now this material is only needed for the Statue of Zoltun Kulle and crafting Sigils for Nightmare Vaults.