Mark XV
A prototype for Mark XV Clockwork Cherubs was once created. It was “mountain-sized”, and ended up wreaking so much havoc on a whole dimension that the Copper-Colored Council of Elders, at least one member of whom had witnessed the destruction, intervened to have the whole line scrapped and make sure the definitive Mark XVs would be much smaller. The Cupid Council later recalled this incident when rejecting Magnification-236's suggestion to make the Mark XVIIIs very large. (PROSE: The Cupid Suggestion Box)
As actually made by the Great Foundries, production Mark XV units were much smaller, bearing a roundel and crisscrossed pipes set-up also seen in Mark XVIIs — as evidenced by Valerius-1497. (PROSE: Lord Thymon and the Department of Problem-Solving)
