ses two ancient bronze keys, he remains unfazed.But he thought, having so many old brass keys couldn't hurt.To enter the deepest core of Emperor Xuanyuan's Mausoleum, a bronze key is definitely requir...enly Sovereign Elixir.Even at the very end, when he mysteriously disappeared, it was never used.And right now, in that pill furnace, if nothing unexpected happens, it is the Heavenly Sovereign Pill re...