I couldn't find this in the forums, so I'll ask and apologize if it's been asked a million times.

That Atma Weapon, that blue thing, how does it work?

I read that it does more damage if you have higher HP, and that's very obvious. (Good Job zombifying the dude with Atma Weapon! HAHA! Idiot Necs.)
But then I read that it levels when you level, and this I don't understand. Peoiple put a lot of stock into the weapon, and I'm just figuring it now, in the WoR, that maybe I should have been using it.

So.... Question.
1. Does it get stronger and more damaging per, I guess, HP? Or does it get stronger another way.
2. If the other way is leveling, does that mean that I should restrict the Atma Weapon to a single character who will carry it and level with it and, I guess, someday, kick ass with it? Or, again, does it work another way?


Or am I retarded?