Did you already craft the Processed Scarlet Soul Stone?

“I did. Here.”

Good enough. HQ should be satisfied with these.

“I don’t suppose you can tell me why you need these.”

You’ve done excellent work, [%username]. Perhaps if you continue to do so, I’ll be able to answer more of your questions.

(Click Reward in the quest window to report the mission results.)

(Click OK to obtain the reward.)

Completion:

Lana of the Pandora Labor Agency asked you to craft Processed Scarlet Soul Stones with the Scarlet Soul Stones that you can obtain from the creatures within the agency's territories.

You completed the task and asked how the Processed Scarlet Soul Stones are used, but were rebuffed.