The reason is that he urgently needs to collect materials to craft a weapon tailored for himself.
However, wanting to own his own Spiritual Treasure is not easily achievable now, because the Lin Family does not yet have their own Fourth Order Refiner Master.
If he wants to have his own Spiritual Treasure, he either has to wait for Lin Shilu to break through to the Nascent Soul Stage or seek external assistance, meaning asking other Fourth Order Refiners for help.
But Lin Shilu is currently only at the Golden Core Great Perfection Realm, and even if he successfully breaks through to the Nascent Soul Stage, it will take at least another ten to twenty years.
Moreover, there is no guarantee of a successful breakthrough, not to mention advancing the Artifact Refining Technique to the Fourth Order level.
Therefore, if everything goes smoothly, Lin Tianming would have to wait at least thirty to forty years for Lin Shilu to assist in refining.
