You may be saying "Augh another one..." well, deal with it, xD...
Anyways; Stage 1.
No matter what class you are, just attack, and use Supression when Metabii use enrage. Buy the Shirt and shoes, but no new weapons, you'll get them in a minute.
Boss Fight: First off, the only attacks you should have are: Smash(Not Gunslinger); or Magic Bolt(Not Destroyer). Also, I advise getting one point into "Aggression" for all classes. It is a great skill. Now, kill the Medic first. After that, It is easier to kill the Captain. Leave the Assault for last. Watch the scene, and save afterwards.
I'll post more soon, but I got to go to bed(It's 3:00 here...)
I was joking with that line. Get a sense of humor. Did you notice the smiley? I'm new around here, so you know what, I don't care unless you're a moderator...
Stage 2 Items/Enemy Info.: Alright, first to find out what enemies you'll be fighting. For Assassin: Hunt Ghost Assassins For Gun-Slinger: Hunt ZPCI Hunters For Guardians: Hunt Ghost Samurais For Destroyer: Hunt Ghosts
I'll list the best equipment in a later section...Also, hunt the Ghosts for "Moon-Struck Horrors"; and yes, it does drop from them.