So the new TF2 EOTL update features a thing called a duck, which you can equip. It says you can find ducks from fallen enemies and use them to upgrade your duck.
Now i"m a little confused because in the store there is a Duck Token, which also appears to level up the Duck. So what's the difference between just killing enemies to get ducks as opposed to getting Duck Tokens?
How do I level up, or upgrade my duck?