Wow, with the hero's party messing around the demon lord seriously try to make MC go to the kindergarten instead of letting him explain his situation to the heroes ?
"nothing too flashy" he says and proceeds to grab a sword. literally a weapon of nobility and wealth.
lower class melee weapons would have been axe, mace and spear. anything with less refined metal in it.
I feel like the one person who might be able to see it's the old cross is the priestess since she can probably see souls or some weird ability like that