The uppermost slab, which sits horizontally across the top, is the most elaborately worked of the three. It measures just over two metres in length and carries a chamfered edge, that is, a bevelled margin running around all four sides, giving the stone a refined, intentional finish that suggests a craftsman working to a clear brief rather than improvising.

The decoration carved into the slab's surface is its strangest feature. A seven-armed segmental cross, cut in relief, rises from a pillar-form base and is marked by three cross-bands where the shaft meets the head, with a single band lower on the shaft. The seven-armed form is unusual; the standard Christian cross has four arms, and variants with additional arms appear in insular and continental medieval stonework but are far from routine. A well-defined border frames the composition cleanly, yet within it there is no inscription and no date. Whoever commissioned this stone, and whoever lies beneath it, left no name. The slab rests under an arch in the east wall of the north transept of the abbey's graveyard, a sheltered position that has helped preserve the carved detail. The Augustinian community at Fethard was one of the medieval religious houses that shaped the town, and the abbey complex still stands in recognisable form, making the stonework accessible rather than buried in rubble or relocated to a museum store.