Inside William's mind, sixteen ten-meter apple trees grew side by side, half of which were just over halfway to bearing fruit. Budding amongst the leaves of the other eight Element Farms were a hundred Element Fruits each, of the Earth, Sound, Blood, Blessing, Curse, Dream, Fate, and Karma Elements respectively.
William had spent almost a Billion Potential Points purchasing and upgrading the eight Farms to A-Rank, and he didn't choose any of these Elements randomly.
The Earth Element was a gimme, since if he could give it a Primary Law, it would be William's current second strongest Element after Fire. Not to mention its usefulness in completing the System Quest.
He saw Sound and Blood Deity Shards advertised while in the Treymon Auction House, so William was at least confident that they were obtainable somewhere across the Plane. Blessing, Curse, and Dream were all situationally useful, and they were generally better options than the combat-based Common Elements.