Yes, it is real, to a degree. Michael Crichton made his own variation for the movie 13th Warrior, but the actual prayer is a Norse prayer dating back to the first century.
Lo, There do I see my Father
Lo, There do I see my Mother and
My Brothers and my Sisters
Lo, There do I see the line of my people back to the beginning
Lo, They do call to me
They bid me take my place among them in the halls of Valhalla
Where thine enemies have been vanquished
Where the brave shall live Forever
Nor shall we mourn but rejoice for those that have died the glorious death.
The Norse prayer featured in the movie "The 13th Warrior" is known as the "Lo, there do I see my father" prayer. It is a traditional Viking funeral prayer that expresses the belief in an afterlife and the idea of joining one's ancestors in the afterworld. The prayer is recited by the warriors as a way to honor the fallen and prepare them for their journey to Valhalla.
The Production Budget for The 13th Warrior was $125,000,000.
It is based on a manuscript written by an Arab named Ibn Fadlan, where he chronicles his adventure with Vikings in the year 922.
The 13th Warrior grossed $32,698,899 in the domestic market.
The 13th Warrior.
It originated in the 13th Century. It is an Old Norse Word.
The Prose Edda was written by Snorri Sturluson in the 13th century. The Poetic Edda is an earlier collection of Norse Mythological Poems, but we do not know when it was written.
Originally Old Norse for cloud, it entered English with its present meaning around the 13th century.
Loki
The Prose Edda was written by Snorri Sturluson, an Icelandic scholar and historian, in the 13th century. It is a collection of Old Norse myths, poetic tales, and legends that provide insight into Norse mythology and cosmology.
Traditionally, Eid al-Adha lasts from the 10th of Dhul Hijjah to the 13th. The takbir is recited from the Maghrib prayer on the 9th to the Asr prayer on the 12th.
They are called the Wendol or eaters of the dead. Hence the name of the book the movie is about. :)