When Yroa experienced the truth of his divine portfolio and capability to gain divinity, he reached a firmly undeniable conclusion.
To possess a divinity is to possess a terrifying ability capable of fundamentally undermining reality. It goes without saying, but everything that exists within reality possesses a concept, and the divine portfolio works as a masterkey to tinker with each of their respective concepts.
If there was no water, there would be no lake. If there was no sky line, neither a mountain nor sky could exist.
A divinity holds limitless potential to its appointed concept. Yroa understood this, and that's why he was able to create the Blessing of Fertile Potential.
As the Living Deity of Fertility, he was able to meddle with the conceptual state of what is fertile—an existence or a status of productivity, a limitless iteration of journeys and the speed of transformation, whether it is a degenerative destruction, or attaining the unobtained.