The Ultimate Mystery and Supreme Archetype are baseline Tier 0 because the Ultimate Mystery exists "behind all scenes and dreams" as the "final cosmic reality" transcending all local and partial perceptions, hidden behind the Veil, a barrier at least comparable in relative scope to the First Gate and Ultimate Gate, which separates it from the Ultimate Void, a "genuine" and "ultimate" infinity this secret nevertheless transcends by at least as much as the latter eclipses the infinite-but-still-limited lower realms, and the Supreme Archetype scales to the Ultimate Mystery's rating because it exists as an all-encompassing, limitless oneness of essence animating all existence in an "unbounded sweep" that would logically include the Ultimate Mystery, reinforced by how Yog-Sothoth's "awful wonder" made Randolph Carter forget the "supreme horror" of the Ultimate Void, corroborating the Supreme Archetype's similarly immense superiority over the latter.