Another Dungeons & Dragons Campaign (6/6 Players)

Ok then I go to that store and try to sell my 'perfect' bolts

 

You enter the shop. The interior is full of various supplies, but no person seems to be in shop.
???: "Greetings."
You don't know where the voice comes from.

 

Liun:"Hello?" I start looking around everywhere

 

???: "Welcome."
???: "What would you like to buy?"

 

Liun:"Some arrows and maybe sell a crossbow. Now where are you?"

 

Some arrows float up from a bin towards you.
???: "I am here."

 

Liun:"I can't see you"

 

???: "You can't?"
???: "Huh."

 

Liun:"No. Is this some kind of magic?"

 

???: "I think so."

 

Liun:"Wait you don't know? Can people normally see you?"

 

???: "It changes."
???: "Some days, people can't see me."
???: "Other days, people can't remember me."
???: "Some days, people can't hear me."
???: "That one makes running the shop a lot harder."

 

Liun:"If you don't mind be asking what are you?"
Also from this conversation does the voice apper to be male or female?

 

???: "My name is Illurien."
The voice sounds androgynous and rather generic.

 

Liun:"Well it's nice to meet you my name is Liun. So do you know why you're invisible?"

 

Illurien: "I was cursed by the fiend known as Beleren, a devil of considerable magical skill who placed a powerful curse upon me."
Roll a History or Arcana check (your choice) to see what you know.

 

Both have a +0 so history
17

 

Spoiler: Liun Only

Beleren is the name of a legendary mage and folk hero, who allegedly defeated a tyrant and brought peace to the land.

 

That's BBEG number 4!

 

Maybe. Perhaps the planar campaign will kill him in a random encounter.