The first treasure was naturally the Buddha's sharira.
It contained all of the Buddha and Golden Dragon's power. You could refine and absorb it to inherit their unprecedented Saintly Way. It could also be used as offensive weapons with unmatchable power. It was like a huge saintly ancient weapon.
Before the Golden Dragon died, he set four seals on the sharira. Zhang Ruochen had already undone three. If he undid the last layer, the sharira's full power would be released.
Zhang Ruochen had always planned on reaching the Saint Realm before undoing the last seal. Then he planned on absorbing the strength so he could maintain his super-fast cultivation speed in the Saint Realm. He wouldn't have to spend years or decades to have a breakthrough.
Now, Zhang Ruochen had dozens of saintly medicines and one Saint Dragon pearl. They could totally help him reach the mid-level of the Saint Realm. He didn't have to absorb the Buddhist Qi and Dragon Qi in the sharira.