But one slab stands apart from the rest: a carved effigy depicting a bishop in his pontificalibus, the full ceremonial vestments of a Roman Catholic bishop, robes, mitre, and the other regalia of ecclesiastical office rendered in relief upon the stone. This particular slab is associated with Bishop Stack, who died in 1488, and it offers one of those quiet moments where a face, or at least a formal likeness, is given back to a specific medieval life.

Ardfert Cathedral was a seat of considerable ecclesiastical importance in medieval Munster, and the presence of a bishop's tomb effigy here is consistent with that status. Such effigies were a common way of marking high-ranking clerics in the later medieval period, serving both as memorials and as expressions of institutional prestige. The surrounding uninscribed slabs, by contrast, provide no names, no dates, and no images, which makes the Stack effigy unusual within its own immediate context. The identification with Bishop Stack is described as a tradition rather than a certainty, and the ambiguity extends to the broader collection of slabs at the site, where it is not entirely clear which specific stone was originally recorded or intended for particular attention.