The Truth About Dr. De Lang

The Truth About Dr. De Lang is a Mu Lung + Nihal Desert quest started by Eurek the Alchemist.

Part of Dr. De Lang, the Missing Alchemist: see every quest in order.

Requirements

Offer: What Dr. De Lang wanted was... actually that. He seemed to be so happy that he fell in love with someone... and for him to take this extreme measure... sigh. What Dr. De Lang wanted was in fact, so trivial and empty like this. I guess love painted Dr. De Lang in the corner.
Wait a minute, there's something weird about this note. It looks like there's a huge blank space after the last sentence. It looks like some alchemy was applied to this... I am sorry, but this is the most we can read with my abilities, but... I can introduce you to someone who is capable of uncovering this blank.
In progress: Haven't you met with Alcaster yet? He's currently conducting experiments at El Nath, so I suggest you make your way there soon.
Completion: Hmm? What is it? What? You want me to extract the hidden message in this note? Let me see what this note is about...