"A furnace made from technology older than humanity itself. Once incredibly powerful, its secret has been forgotten."
The Precursor Furnace is a Reborn-tier furnace that is linked to the Precursor Mine. It was revealed by Berezaa on his Twitter page, soon proving that it was a Reborn item.
The Precursor Furnace normally processes ores at x70. However, it becomes activated when it processes an ore from a Precursor Mine, to which it then processes every ore at x500, meaning as long as you process one precursor ore in this furnace, every ore until you rebirth or replace the furnace will process at x500.