C1353 Mysterious Space
Even if it was an expert of Indestructible Stage, the price paid for deducing the Heavenly Mystery multiple times was not small, let alone the fact that Elder Yan was trying to find Lu Chen's whereabouts. The deductions he was making also involved the endless power of space and time.
However, even after paying such a heavy price, Elder Yan still did not discover the slightest trace of Lu Chen