Causal Multiverse V develops the supracausal geometry that organizes perfect universes in Causal Theory (CT). Building on results from Papers I–IV—where universes were shown to evolve along the causal gradient flow, reach coherence attractors, and sort into discrete octonionic feuillets—this work constructs the mathematical structure that exists above the set of attractors themselves. Two independent and fully consistent models are introduced: (A) a finite metric space where perfect universes appear as isolated, non-deformable coherent states; and (B) an octonionic projective meta-space in which attractors are embedded as nodes of a higher geometry supporting meta-coherence flow, fusion operations, and exceptional symmetry actions. The paper proves that both models satisfy all CT axioms and coexist without contradiction. This duality reveals the rigid classification and the deeper octonionic geometry underlying the multiverse, establishing the supracausal structure necessary for future analysis of exceptional groups and higher-order attractors.