"Maentwrog"@en . . "The Maentwrog was imprisoned in a massive oak tree in Sinnissippi Park. It was a berserker, a killing machine that lacked any other purpose of life."@en . "The Maentwrog was imprisoned in a massive oak tree in Sinnissippi Park. It was a berserker, a killing machine that lacked any other purpose of life."@en .