"Depends on the monster, but yeah.  Dad would start arguing with you about that on floor 5 of a mid-rank dungeon - what the Guild would call C-level monsters.  At floor 15 of a major dungeon, A-level monsters, he'd stop arguing with you because at that point it's obvious you'll never be convinced no matter what the monsters say, do, or look like.  It's worth noting that boss monsters come back after they die.  I mean they come back as the same person and recognize you if they see you again, not just that they respawn like other monsters do.  So it's around three floors after the first time you meet a smart boss monster that you've got to start worrying about killing non-immortal smart monsters.  Or if you really want to be sure, you could avoid anything that sets off a『Qualia』-detecting spell.  Some people don't eat cows and stick to chickens because of that."

"Depends on the monster, but yeah.  Dad would start arguing with you about that on floor 5 of a mid-rank dungeon - what the Guild would call C-level monsters.  At floor 15 of a major dungeon, A-level monsters, he'd stop arguing with you because at that point it's obvious you'll never be convinced no matter what the monsters say, do, or look like.  It's worth noting that boss monsters come back after they die.  I mean they come back as the same person and recognize you if they see you again, not just respawn like other monsters do.  So it's around three floors after the first time you meet a smart boss monster that you've got to start worrying about killing non-immortal smart monsters.  Or if you really want to be sure, you could avoid anything that sets off a『Qualia』-detecting spell.  Some people don't eat cows and stick to chickens because of that."