In the long history of the Immortal Domain, some top-grade Immortal Pills and even supreme-grade Immortal Pills that appeared early on are now no longer in existence. The alchemy methods for these pills have either completely disappeared or even their names are lost, while some only have some incomplete pill formulas left.
Many capable Immortal Pill Masters constantly attempt to complete the incomplete pill formulas, but wanting to do so is extremely difficult, and the success rate is very low. It must be understood that even once an incomplete pill formula is completed, it still needs to be verified through alchemy, and the pills involved are extremely precious, the materials required equally astonishing in value. Every failure results in great loss. To successfully complete a pill formula, who knows how many times one might fail.
