300年引きこもり、作り続けてしまった骨董品《魔導具》が、軒並みチート級の魔導具だった件 (Associated Names)

So I continued to stay shut-in for… Huh? 300 years?! One day, a high elf named Edson realized this astonishing truth. Absorbed in his magic tool research, he felt that he had subconsciously let 3 years pass… but in fact, it has been 300 years! Edson decides to go outside and find out what happened…