How do I level up my fireax?

[Adder]

I've spent 4 hours killing heavies and I still can't get it to level up, I heard you had to kill the Uber Solider Boss to unlock it's true potential and allow it to level up, but the dude is way too strong and the fight is so random.

Plz help.

[OmegaZero_Alpha]

1/10

[Zeitgeist]

1/10

+1



(for omega, not adder. never +1 for adder)

[Adder]

1/10

+1



(for omega, not adder. never +1 for adder)

YOU DON'T EVEN KNOW ME!!

[OmegaZero_Alpha]

you HURRCAPSLOCKDURR that like it's a bad thing

[avy]

[Zeitgeist]