Man is at the Border, Yet He Becomes

He was reviewing the Elden Circle at home when he accidentally got electrocuted. Upon waking, he arrived in a time where the stars, moon, and gold coexisted, and he also awakened Escanor's solar magic. However, he discovered that the sun in this borderland had long lost its power... Moreover, here he encountered his teacher Seren, who had not yet been exiled, Rani, who had not yet abandoned her body, his mother-in-law, who was still sane, and a living Marika and Radagon. This was even worse than the beginning of hell! After a while, Reinhardt had an epiphany. Is the power of the sun really so inconvenient? Miguel's lava magic, the prayers of the fire giants, isn't anything that is flames and can emit light and heat the sun?! So he grabbed Shapolili beside him and demanded, "Son, tell me where the insanity is?!"