While the Voice is active in the district, corrupted ores may be obtained from mining any ore, including harmonised rocks; higher level ores yield corrupted ore at higher rates. Corrupted ores may be obtained from the crystal chest in the Iorwerth Clan's district.
With level 89 Smithing, corrupted ores can be used at furnaces, awarding Smithing experience. If using corrupted ores while the Voice is active in the district, swamp tar is produced at a rate of roughly 25%. Players are able to use temporary skill boosts to dispose of corrupted ores at furnaces.
Each corrupted ore gives 150 Smithing experience; 180 Smithing experience with the Voice of Seren active in the district. 1,500 corrupted ore can be used in one hour, equating to 225,000 experience an hour; increasing to 270,000 experience an hour with the Voice of Seren effect. After smelting their first 100 corrupted ores, players can claim an experience lamp worth 50,000 Smithing experience by speaking with Lady Trahaearn. She is located just south of the Seren Stones.
Mining and smelting urns do work with corrupted ores following the August 2017 Update which also allows urns to stack. Perfect juju mining potions and Juju mining potions do not work with corrupted ores. Further, unless the player has completed the elite New Varrock Tasks, the Varrock armour's chance of smelting two ores at once does not work when smelting in Prifddinas. If the armour does smelt two ores at once while the Voice of Seren effect is in the Trahaearn district, the 20% boost to Smithing experience is not applied to the second corrupted ore. Casting Superheat Item on corrupted ores or using Superheat Form during the Voice of Seren will not provide the 20% experience bonus or swamp tar.