Item: Oil of Randomized Armor Class: anoint an object with this viscous oil and roll 2d6 and multiply the results to generate the object’s new Armor Class.

(Sorry I can’t think of a snappier name for it)

Item: urn of Hi-Res Root Beer, granting creatures that drink it the ability to see and hear digital files in greater resolution

Just the thing for your urban high fantasy campaign that draws on both “Dune” and modern police procedurals, in which various organizations compete over control of a substance that lets “zoom and enhance” actually work