The cheapest type is the Third Tier "Void Nether Grass," a Spirit Grass that grows on a Void Nether Ore Vein.
Void Nether Ore is the main material used to make Storage Rings, Storage Pouches, and other Space Artifacts, so Void Nether Grass also possesses some Spatial Attributes.
With his current permissions, he can only see Fourth Tier middle-grade Spirit Grasses with Spatial Attributes. Anything above that, like the Fifth Tier, involves Nascent Soul and is beyond what he can access.
Furthermore, the price of the Fourth Tier middle-grade "Sub-Space Crystal Grass" is not only 2,300,000 Spirit Stones but also requires 10,000 contribution points— and even this is only possible for him to purchase due to his status as an Inner Sect Disciple and Nascent Soul Disciple.
This stark price difference gave him a profound understanding of the weight of sect contributions, so without hesitation, he chose to spend 30,000 Spirit Stones to buy a Void Nether Grass.
