Male MC is either reincarnated or transmig or both, only scene I remember is there's an elf smith and she was like only chosen by my kids (weapons she made) can be wield by them. Then next scene all weapons were practically hovering around MC,and he was like thank you I'll accept for now someday I'll pass you on to someone worthy or smtg, and the elf was like why.
Read it way back when the manhwa have not introduced the priestess princess yet, so out of sheer curiousity I searched for the novel and found it. Read ahead and so far, it's very good. World building is presented well and questions are slowly being answered regarding the parallel worlds, the summon and it's possible summons's abilities, and the perils of the upper floors. Highly recommend