The blood he obtained from the cocoon allowed Zhou Wen to see the hope of advancing to the Epic stage, he was just short of his Constitution reaching 21 points.
Now, Zhou Wen was aware of two locations where white cocoons could be found. One of them was at the nest of Chick's mother. Zhou Wen didn't dare go there. Even Ah Sheng didn't dare put up any resistance. Even if he were to activate Sigh of the King, he would probably only be courting death.
Besides, now that Chick was with Zhou Wen and had helped him before, Zhou Wen couldn't bring himself to touch the white cocoon that the giant bird was protecting.
Then the only one left is the white cocoon that's protected by the wyrm under the Old Dragon Cave. Zhou Wen felt a headache coming on when he thought of the wyrm.