The use of runic script in the Codex Runicus serves multiple purposes. Firstly, it provides a means of encoding the text, making it more difficult to decipher for those unfamiliar with the script. Secondly, the runic script adds an air of mystique and secrecy to the manuscript, underscoring its potential significance.

The Codex Runicus is a manuscript composed of 136 pages, written on vellum, a high-quality parchment made from animal skin. The codex is believed to have been created in the 14th century, specifically between 1300 and 1325, in Scandinavia, possibly in Denmark or Sweden. The manuscript's origins are shrouded in mystery, but it is thought to have been written by a single scribe, who meticulously copied the text, adorned with intricate runic script.

The Codex Runicus is written primarily in the Elder Futhark, an ancient runic alphabet used by Germanic peoples. The Elder Futhark consists of 24 characters, each representing a distinct sound or concept. The runic script used in the codex is a variant of the Elder Futhark, known as the "Rök runes" or "Runic script of the Rök stone." This script is characterized by its distinctive letterforms, which are often ornate and decorative.

The Codex Runicus is a significant cultural and historical artifact, offering insights into medieval Scandinavian knowledge, literature, and spirituality. The manuscript's use of runic script and cryptic messages has captivated scholars and enthusiasts, making it a rich area of study.