Try talking in the Ancient language.

Quest Text A great task comes with an ordeal.
I still recall my grandpa's saying from time to time.

Summary Oh! Looks like you can read the Ancient language?
And yet, it appears that you could use some more practice... Hoho!
By the way, is this... Tatar's key?
How did you get your hands on this? Ah... you found it?
Right. This special key is from the times of the Ancients.
Some say it leads to shiny treasure.
The word you spoke to me just now...
Yes. That's exactly what this key will open.
Hoho... Sorry for blabbering about.
Anyway, it's just a tale of the Ancients. Nobody knows it if truly exists.
Ah... I shall return this key to Tatar myself.
You have a good day now, adventurer!

Summary Did you deliver these on behalf of Ossa Dilla NPC Knowledge?
Thank you, these supplies will cheer up the Katan soldiers.

Summary You appear to be rather good with your hands...
Why not try meeting with Carolin NPC Knowledge of Heidel in Serendia?
If you can master her Expert Packaging Skills,
you'll be able to pack delivery boxes at a quicker rate.