The article introduces a new theory called Metaphysical Unificationism, which aims to explain metaphysical concepts in a holistic way similar to how science explains natural phenomena. This theory suggests that explanations in metaphysics can be achieved by deriving many outcomes from a few basic principles using specific patterns. It also distinguishes between metaphysical and scientific explanations, shows the relationship between naturalness and fundamentality, and emphasizes the connection between explanation and understanding in metaphysics. Despite potential objections, Metaphysical Unificationism offers a fresh perspective on metaphysical explanation.