Abstract Cosmos, life, death, and ethics are standardly assigned to separate disciplines with separate ontologies. This paper shows that all four are appearances of a single constraint architecture: the Triaxial Existential Field (C–R–P) under the exclusion of null-equivalence (ItoE). No new primitives are introduced. The paper inherits its full ontological and structural apparatus from prior work in the TEF programme and applies the method of progressive constraint revelation: each section removes a remaining way that persistence could avoid the full weight of its own constraint. The cosmos holds without registration (cost as resistance). Life holds and must regulate that holding (cost as vulnerability). Death reveals that holding will fail (cost as irreversibility). Ethics is what remains when a system that holds, knows it holds, knows it will fail, and can steer its participation (cost as responsibility). The four costs are not four separate phenomena but four exposures of the same structural fact — that admissible persistence is never free — at four levels of reflexive integration. Suffering is identified as the reflexive registration of cost exposure, structurally inseparable from self-maintenance. Grief is the correct registration of irreversible closure-loss. Compassion is the regulated redistribution of cost. The paper's structural conclusion: wherever explicit reflexivity obtains under cost in irreversible history, imputability — the attribution of consequences to the system's modelling and steering capacities — is structurally unavoidable. The transition from imputability to ethics is a praxis commitment grounded in these structural facts, not a further derivation. The paper fails if any section does ontological work not traceable to its dependencies, if the four-cost table contains a cell without structural ground, if the ethics derivation requires premises beyond integrated reflexivity under cost, or if death is treated as negation rather than release of holding.
Jaimes Chao (Wed,) studied this question.