The manuscript of the Old English Runic Poem has been destroyed in a fire in 1731, but the text is fortunately preserved in a 1705 edition by George Hickes based on a fairly reliable copy by Wanley; it consists of 29 short stanzas, one for each rune of the expanded Anglo-Saxon fuÞorc. The other two poems come from Scandinavia: the Norwegian one is known through various XVIIth c. copies of a manuscript lost in 1728 (the text consists of a set of two lines each for the 16 runes of the shorter new Scandinavian fuÞark, dating back to the latter part of XIIIth century); the Icelandic one is preserved in four manuscripts - the oldest from the end of the XVth c. - and describes each of the 16 runes of the new fuÞark in a three line stanza. A lot has been written about these runic poems, and undoubtedly, they may contain some old traditional material, but it would be nevertheless difficult to assume, as R. M. Meyer did back in 1907 ("Die altgermanischen Runengedichte", in P.B.B, vol. 32, pp. 67-84). that they all derive from a common Germanic prototype. The terseness of the Abecedarium Nordmandicum fairly well excludes such an assertion, and it is more plausible to assume that the striking formal parallels in the poetic diction of the Norwegian and Icelandic texts; e. g.. under Þurs: kvinna kvillu vs. kvenna kuọl; under bjarkan: laufgronstr lima vs. laufgat lim: etc., are simply due to the prevailing scaldic tradition, as Lucien Musset (Introduction à la runologie [Paris, 196..5], p. 127) suggests. The rune ᚦ is called Thurs in the Icelandic and Norwegian rune poems. In the Anglo-Saxon rune poem it is called thorn, whence the name of the letter þ derived. It is transliterated as þ, and has the sound value of a voiceless dental fricative
Ero vǫlor allar frá Viðolfi, ~ All the vǫlor are decended from Viðolfr
vitkar allir frá Vilmeiði, ~ all the vitkar from Vilmeiðr
en seiðberendr frá Svarthöfða, ~ all the seiðberendr from Svarthöfði
jötnar allir frá Ymi komnir, ~ all the giants from Ymir
Völuspá in skamma (The Shorter Völuspá)
Key: seiðberendr = seið-carrier ~ vitkar = warlocks/magicians ~ vǫlor = seið-witch
Magic either works or it does not work for the sorcerer or witch. The idea of negative or evil magic is a modern concept based around religious Church doctrines stemming back to the Middle-Ages. There is also a Battle Aspect to seiðr which you will find by delving much deeper into the sagas. It is historical.