The obsidian crystal could assist Zhang Han in his cultivation. With such a small piece, although it could not help Zhang Han break through to the middle stage of Qi Cultivating Stage, it could at least help him increase his strength by 30%. However, Zhang Han did not plan to use it for cultivation, because it still had a lot of uses.

Do you still remember the Jade-fire dew from the thunder yang tree?

The first stage spirit treasure was close to the second stage and ...