🍁Nine Ancient Obelisks

- Once, I managed to modify mosquitoes so that their proboscis couldn't pierce human skin, hoping that this would ruin their gene pool and they would stop biting me at night! But guess what? Because they lost the ability to feed on blood, they lacked the nutrients needed for reproduction, and moreover - healthy mosquitoes didn't want to mate with them! As a result, my mosquitoes simply died out. So, be very careful in your research.
It's unclear why Snafgoria told Erika this story.

Did the Sarrian furniture also become unusable?
Can "experimental potions" be used during battle? If so, is it also only from another slot?

Doesn't seem like it.
No.