3 quick axe questions

Sorry if this is covered elsewhere, but I have some questions:

1. What makes a Chaos axe special besides the cool look? Does it get around armor or something?
2. What is the "max damage" for an axe? I hear 28 a lot, as in 6-28
3. Are Chaos axes upgradable like any other axe?

Thanks

1. I think it's just the looks that gets everyone obsessed with them. Just like those Fiery Dragon Swords.
2. Yep, 6-28 is max damage.
3. Umm, I'm pretty sure they're upgradable like any other axe.

OK thanks Tsukiyomi. I wasn't sure if it did "Chaos" damage or something that would get around "+X AL vs Physical Attacks" or something. Not that I care, the glow is fine enough.