Fortunately, this time it finally worked!
[Level 3 Ability · Iron Wall]
[Iron Wall: During its duration, it can enhance defense, speed, spirit, constitution, shooting, and slowly recover from certain injuries (Side-effect: None)]
If I could get two more Extreme Speed Crystal Cores, then Iron Wall could be synthesized to the upper limit of Level 3!
That is to say, Wang Tao now just lacks the Ability Mastery. This ability is an active attack Ability, and there is no suitable option for now. I'll have to pay more attention in the future...
In the end, Wang Tao extracted Iron Wall and merged it with the Omnipotent Crystal Core.
Only Berserk Enhancement and Yin and Yang Balance remained in his possession, with Berserk Enhancement already at +10; naturally, the Omnipotent Crystal Core was utilized on the Yin and Yang Balance.