Although the Rexcalibur tome from the Tellius Series appears to be a variant of the Excalibur tome at first glance, it actually bears a closer resemblance to Fimbulvetr.
Excalibur is the name of the legendary blade wielded by King Arthur. A distinction is usually made between the blade that he received from the Lady of the Lake and the sword which he pulled from the Artognou Stone to prove his kingship. Thomas Malory, author of 'Le Morte d'Arthur," asserts that the name Excalibur connotes the meaning of 'cut-steel.' Earlier versions of the name include Chaliburne, which brings to mind the French word for 'heat' (chaleur), and the English word 'burn,' which either means 'burn' as we understand it today, or 'man'. Before breathing his last, King Arthur requested Sir Bedivere, his last remaining knight, to throw the Excalibur blade into a lake, whereupon the Lady of the Lake reclaimed it.