Following Lu Chen's order, a huge amount of mastery points rushed into Avalon, which was now one with Lu Chen, and entered the core of the secret realm, the Golden Apple tree.
The influx of a huge amount of mastery points had made the Golden Apple grow, and the mastery points could indeed be used as nutrients for the growth of the apple tree.
Unfortunately, this was only a form of stimulation, not experience that could be used as firewood. The growing Golden Apple tree quickly drew out a large amount of immortal energy.
The immortal energy that could make a person stay young forever and extend their lifespan gushed into Lu Chen's body and was greedily absorbed by the cells in his body.
The fusion just now shortened the evolution that took hundreds of years to a short moment. Even if Lu Chen's body was tough, his cells and genes were still damaged.