Weapon Memento: HD twins(Holy-Dark, not high definition); Ragnarok and Excalibur

Once upon a time, two legendary weapons, Ragnarok and Excalibur, were made by two nameless swordsmiths. **
** Well, those two swordsmiths went missing and they were unseen by anyone after having handed the two weapons to Lady of the Lake. The reason behind that is, well, unknown.
** A rumor suggested that they were called “Gang Jiang” and “Mo Ye”, the famous swordsmiths couple in China in the past. *** It is remained unproven, however.
*** More info about “Gang Jiang” and “Mo Ye”: http://en.wikipedia.org/wiki/Gan_Jiang_and_Mo_Ye
** Another rumor suggested that Ragnarok and Excalibur were actually the children of Lady of the Lake. It is remained unproven, also. Only heaven knows the answer…
Thus, actually they were brothers (and twins).
Even though Ragnarok and Excalibur were adopted by Lady of the Lake in the same time, she liked only Excalibur, as Excalibur is holy-type weapon, whereas Ragnarok is dark-type weapon. **
** It is believe that “dark” is devil-related and brings creepy and hopeless feeling to people, whereas “holy” is equal to “light” that brings hope to people. So, many people dislike “dark” and like “holy”.
** Summarised, in most people's mindset, dark is evil and light is good.
Neglected and even disliked by his mother, Ragnarok started to do many things, like playing pranks, bullying (and even hitting and abusing) Excalibur, to get attentions.
But, it backfired; Lady of the Lake disliked him more and more. 
Sometime, even though Excalibur was being annoying and Ragnarok just intended to teach him lesson, Lady of the Lake would just scold Ragnarok.
Excalibur ended up becoming an annoying spoiled brat.
Ragnarok could no longer tolerate it. Thus, he left home.