Monday
Monday possesses what scholars term absolute temporal permanence. Unlike physical entities subject to entropy, Monday exists as a mathematical certainty within the Gregorian calendar system. It cannot be destroyed, delayed, or diminished by any known force in the universe.
Archaeological evidence suggests that the concept of the first weekday has survived the collapse of every major civilisation in recorded history. The Roman Empire fell; Monday persisted. The Byzantine Empire crumbled; Monday remained. This entity demonstrates a durability that transcends mere physical resilience—it exists in the realm of pure inevitability.