In Irish mythology, Tethra of the Fomorians ruled Mag Mell after dying in the Second Battle of Mag Tuiredh. After the battle, his sword, Orna, was taken by Ogma and it then recounted everything it had done.
Tethra was the god of darkness and king of the dead.
"Tethra" is the name of an armor set for the Highlander in For Honor.
- Cross, Tom P. (1936). "The Adventures of Connla the Fair". Ancient Irish Tales. Henry Holt & Co. Retrieved 1 May 2013.
A woeful seat where Connla sits! Among short-lived mortals, Awaiting only dreadful death. The living, the immortal call to you; They summon you to the people of Tethra
- McCullough, David W. (2010). Wars of the Irish Kings: A Thousand Years of Struggle, from the Age of Myth Through the Reign of Queen Elizabeth. Random House Digital, Inc. p. 18. ISBN 978-0609809075.
Now in that battle, Ogma the champion found Orna, the sword of Tethra, king of the Fomoire. Ogma unsheathed the sword and cleaned it. Then the sword told what had been done by it, because it was the habit of swords at the time to recount the deeds that had been done by them whenever they were unsheathed.
- Julius Pokorny: 1079. Cf. also   "Archived copy". Archived from the original on 2006-02-11. Retrieved 2006-02-11. Cite uses deprecated parameter
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- "In Dúil Bélrai - Old Irish Glossary". Retrieved 2019-03-11.
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