Mystic Knights of Tir Na Nog

The Barrow of Balin (1x41)

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Cathbad receives a warning about Rohan and great danger from the ghost of Balin, Kells' greatest warrior. It turns out Maeve is attempting to summon the warrior and succeeds, gaining control over him. She sends him to capture Cathbad so Mider can drain the druid's powers. To rescue Cathbad, Rohan will have to journey into the dangerous Barrow of Balin and face the legendary warrior alone.