The theory of the copulative existence of the effect suggests that contingent realities are purely copulative and connected to the Necessary Existence (God), lacking any independence and entirely dependent on Him in their essence. Based on this theory, a fundamental transformation in ontology occurs. This theory, in fact, offers a fresh perspective since it provides a new interpretation of reality. Thereby, it will have various implications that are effective both in human epistemology and ontology. In this research, we aim to explore and describe the ontological aspect of this issue and examine its implications. Some of them are as follows: the particular unity of existence, the formulation of the argument of the truthful (Burhān Siddīqīn) based on the theory of the copulative existence of the effect, the falsity of infinite regress, the dependency of contingent realities on the Necessary Existence in their essence as well as in their attributes and actions, and the criterion of the dependency of the effect on the cause. We strive to investigate this issue in light of the critiques of Ayatullah Fayyazi.