It is the lower portion of a graveslab, just over half a metre long and two-thirds of a metre wide, broken off from whatever larger memorial it once formed. No name was ever cut into it, or at least none that survives or can be traced.

What remains of the decoration is a lightly incised outline cross-stem, the kind of shallow carving worked directly into the stone surface, terminating at its base in a trefoil motif, three rounded lobes that would have been immediately legible to a medieval viewer as a devotional flourish. The surface is weathered, though the design remains readable. The slab was recorded by Maher in 1997, lying roughly five metres from the east gable of the chancel, which places it in what would have been one of the more spiritually significant parts of the Augustinian abbey, the area closest to the high altar. Augustinian canons, who followed a rule of communal religious life derived from the writings of St Augustine, established the priory at Athassel in the late twelfth century, and it grew into one of the wealthiest and most important houses of the order in medieval Ireland. To be buried within the chancel, even anonymously, would have indicated some degree of standing.

The slab belongs to nobody now in any recoverable sense. Its precise position within the ruin, resting against the wall as though set aside, gives it an almost incidental quality, a fragment that has outlasted everything that once gave it meaning, including the name of whoever it marked.