[TheRaizin]

This episode's production notes are particularly interesting:
-Logos needs the WRBs to obtain the content of the Book Of Omniscience to get that "world-rewriting" power that he needed
-Saikou and Kurayami were made in the Wonder World, while the rest of the swords were forged by succeeding swordsmen of SOL
-The seikens act as sort of "bookmarks" for the Book Of Omniscience as they have the power to disrupt the borders of the worlds, which was why the swordsmen could enter worlds that were ruined by the Megid. (Episode 2)
- The Wonder World's sacred power comes from the Book Of Omniscience, that's why when the Seikens are bound together, resonate with each other and bridges a gap to the Omniscience book's Table Of Contents
-During Episode 15, Kamijou managed to recreate this phenomenon even with only six swords to reach the Table Of Contents, had he obtained this power, he would have the power to surpass Master Logos
-The seals put on the Seiken by Kento and Kurayami were undone when he was defeated by Falchion. (Notice Hayate's logo as it flies away)
-Kento stubbornly sealed the swords, saying he's would save the world, but his heart began to stir after hearing the words of Touma, Yuri, and the cry of Ren whom adored him.