In one story, Odin uses Gungnir to break the sword of Siegmund, which then leads to Siegmund’s death. Later Siegfried, Siegmund’s son, encounters Odin and breaks Gungnir in two – perhaps an influence for Gungir’s two distinct appearances in Symphogear. It’s also interesting to note that Odin commanded “special warriors” sometimes referred to as the Úlfhéðnar, or more commonly known as Berserkers. They were known for their intense anger in battle that was unfazed by injuries. No doubt an influence for Hibiki’s “berserker” state.
Yew wood was preferred over other trees for making bows. In Japanese, this particular wood is called “Ichii” which establishes the first half of the weapon’s name. The “val” part is less clear. Some people say that it’s a warped pronunciation of “ichii no tani” (the Japanese name for Ýdalir), and others think it derives from a shortened form of “ballista” (a giant crossbow-like weapon). Considering it’s appearance in Symphogear this seems likely the case. The bow possessed by Ullr was said to have the power of 10 arrows for every one it released.
Ame no Habakiri
Before his death Roland attempted to destroy Durendal to prevent it from falling into the hands of the enemy. Using all his pent up rage and pain he swung the sword repeatedly against a giant rock trying to break it, but instead he ended up creating La Brèche de Roland (a large gap in the steep cliffs within the Pyrenees mountain range). Eventually he came to the conclusion that the sword could not be destroyed with human strength and hid it underneath his body. The local folklore of one town in France claims that instead of hiding the sword, Roland threw it and it was embedded in a cliff where a fragment of it still exists today (but there are claims it is a fake). It's interesting to note that Durendal itself was known to contain multiple sacred relics inside of its golden hilt. These included: a tooth from Saint Peter, the blood of Saint Basil, a strand of hair from Saint Denis and a piece of robe worn by Saint Mary. Also the supposed forger of the sword, Wayland the Smith, was known for forging other famous swords such as Caliburn (later known as Excalibur) and the magic sword Gram which was wielded by Siegfried when he broke Gungnir in two.
Shul Shagana and Igalima
The root source for these are muddled for a number of a reasons. It mainly has to do with differences in research and mythological literature between the languages. I think only Japanese research references these two as weapons, not to mention Zababa being a female god. Whereas if you read anything in English, they are sons and Zababa is a male. The reason Zababa might be thought of as female in Japan is that he was paired with (and sometimes mixed) with the famous female god Ishtar (aka Inana).