Ein Sarg in einem versiegelten Raum in einer zerstörten Kirche mitten im ländlichen Irland.

Looks like you got some leprechaun eggs growing there too.

Coffin in a room in a church in a bog down in the valley O

Chest tomb, I believe.

Got this in the comments from where I cross posted it from. According to local lore:

• A churchman (often said to be a bishop or abbot) buried at Kilmacduagh was considered deeply sinful or corrupt in life.

• After burial, disturbances were reported—unnatural sounds, movement, or the belief that the body would not rest.

• Fearing a curse or malevolent presence, the monks were said to have sealed the grave with heavy stone, sometimes described as being mortared shut.

• The sealing was meant to contain the spirit and prevent further harm, a practice echoed in Irish folk belief about restless dead rather than formal Christian doctrine.