The upgrade conditions are as difficult as ever.
Upon careful consideration, that long string of zeros is actually not the problem; rather, it is the single Top-grade Spirit Stone and the Thousand-year Spirit Milk and Ten Thousand Years Spirit Milk that are particularly challenging.
Top-grade Spirit Stones are not something that even superior Spirit Veins might produce.
Simply put, even some Nascent Soul Cultivators may not possess a single Top-grade Spirit Stone.
Therefore, for Ji Yuan, it's not necessary to even think about upgrading the Spirit Vein during the Foundation Establishment Stage.
At the very least, one should wait until the Golden Core Stage to consider it.
However, as it stands, a Level 3 Spirit Vein is sufficient to sustain his cultivation needs.
Ji Yuan closed the panel, his mood greatly improved, and took out a flask of Heart's Desire Wine, sipping it as he inspected several other buildings.
