Ethical discourse is often grounded in human intention, moral reasoning, or normative prescription. This paper offers a descriptive alternative: ethics is examined as a preanthropological relational condition concerned with how cost is borne under change. Rather than deriving obligations or recommending action, the analysis focuses on the structural conditions under which ethical coherence persists, degrades, or collapses. PortusEthica™ introduces a minimal triadic orientation-Conservation, Adaptation, and Environment-to describe how relations retain continuity, transform under constraint, and remain conditioned by surrounding conditions. Within this framing, ethics is understood as the legitimacy of cost placement across relations, whether cost is placed deliberately or passively through ignorance, limited capacity, or environmental pressure. A central claim is that change is not merely additive. Under constraint, change alters the conditions of subsequent change, potentially reshaping or foreclosing future coherence. Ethical collapse is therefore treated as the loss of coherent relational form without erasure of consequence: cost persists even when the structures that once organized its placement no longer exist. The paper deliberately refrains from grounding ethics in reason, cognition, or moral theory. No is-ought bridge is asserted, and no normative remedies are proposed. An illustrative, nonexhaustive example is included solely to demonstrate recognizably, not justification.