"So, the sword you got from the library event was something like a key?"
"You can say that… there are many kinds of swords in this world, and some are special. This white sword is perhaps the most special of them all. But, I can't use it. And as long as I have this, the only special sword that I can use are the ones like that crimson sword that you have seen already."
They are the actual keys.
And she was searching for the rest of them.
"The downsides are many.
When I got it, I lost all my levels and most of my unique stats were sealed along with my servants, skills, and powers.
Obtaining the original keys, the sword like that red one grants me back a certain portion of my powers– but with the ones like I got from the steller pouch, I can unlock a portion of those powers once.
Some common things will become available with level up as well. That's why I am so focused on leveling and hunting."