This is a bullaun stone, and what makes it quietly compelling is how ordinary it looks until you notice that single circular hollow, roughly 35 centimetres across and 13 centimetres deep, sitting slightly off-centre towards the broader end of the slab. The depression's upper edges are rough and irregular, suggesting it formed naturally rather than being cut by a careful hand, which raises the question of whether early Christian communities recognised something already present in the stone, or whether repeated ritual use simply deepened what nature began.

Bullaun stones are found at early ecclesiastical sites across Ireland. The word likely derives from the Irish "bullán", meaning a round hollow or bowl, and these features are generally associated with early medieval religious activity, though their exact function remains debated. Some were used to grind or pound materials; others accumulated rainwater that was believed to have healing or protective properties. The Kilteany example is a substantial piece of stone, nearly two metres long but tapering sharply from 1.35 metres at its widest end down to just 30 centimetres at the narrow end, giving it an almost wedge-like profile only 20 centimetres thick. Its position beside the church, rather than incorporated into any structure, is typical of such stones, which often occupy threshold or boundary spaces within their sites.