[RPG] In the Starter Set, how can PCs learn the password?

dnd-5elost-mine-of-phandelver

In the D&D 5th starter set scenario(Lost mine of Phandelver), there's a part where players can repel skeletons by saying a password (p.22). However, I cannot find where & how players learn this password in the scenario. Could you enlighten me here please?

Spoiler Alert !! The following is the script from the scenario book.

The three skeletons are animated and attack any creature that comes within 10 feet of the door leading to area 5 or the door leading to area 6, unless that creature is wearing the scarlet cloak of the Redbrands or speaks the password "Illefarn" (the name of an ancient elven nation, which once spread across much of the Sword Coast)

Best Answer

They'd have to learn it from a Redbrand.

Two ways that can happen: wittingly or unwittingly.

On p.20 is a sidebar describing what a generic Redbrand might know and share if questioned. It's no stretch to allow a particularly good line of questioning, or a particularly persuasive questioner, to gain the password as well. The presence of skeletons guarding the crypts is already contemplated as a topic of conversation, after all.

Or a PC could overhear a Redbrand using it. It's an unlikelier scenario (IMO), but there is a potion of invisibility in play....