Soul Base Materials are rarely found in the outside world; they mostly originate from Secret Realm Spaces.
For example, the Sulfur Fire Sand from Sulfur Fire Ore and the Flame Crystal Stones from Flame Crystal Ore, both found in the Horned Demon Secret Realm, are Soul Base Materials used for arranging and constructing Fire Attribute Soul Bases.
If a Guardian Beast Master with a Fire Attribute Lifebound Guardian Beast uses Sulfur Fire Sand and Flame Crystal Stones to construct their Soul Base, it will boost their Lifebound Guardian Beast's Energy recovery while inside it.
Being a Guardian Beast Master is a very resource-intensive profession. A powerful Guardian Beast Master is forged from countless resources.
To put it bluntly, resources are money. However, some particularly rare and precious resources can't be bought, even if you have the wealth.
