Alright, since this dungeon I just did is a bitch, I'll write a guide to help you all.
MOONLIGHT TAVERN
Getting the epic quest
Moonlight Tavern is a one dungeon area, found in Suisha's Tavern. You can access it at level 39. If you don't have the epic quest already, check your epic quest list (W). Accept the quest called "The Dark Slayer".
Part 1: The Dark Swordsman
Simply go talk to Suisha to complete this.
Part 2: Searching
Accept the quest, and go to the right to find the entrance to the dungeon.
Welcome to Moonlight Tavern. I gotta say, I liked what they did with this dungeon. You can see fights going on in the background between random bar attendees, and tables are flipped over and such. Anyway, just clear the first 2 rooms, and you're done. Not much to say here.
Part 3: Psychopath (Okay, I think that's the name, I don't remember)
Preparation: Make sure you have at least 5 decent healing potions for hp and mp, or at least 1 token.
Expert's Road. If it was as easy as the first time you did it, I wouldn't be writing a guide. But simply put, it isn't.
First room, clear the enemies, simple.
Second room, make sure you get rid of all the enemies near you before going to the left side of the room (unless Psychopath is already coming after you). Believe me when I said you need those items, you'll see why.
Psychopath is a priest, a monk to be exact. At the start, he'll use Will Driver. Everytime.
This is the only time he'll have 6x hp bars, though, so be happy. Keep in mind I did this with a grappler, long-range/faster classes should be better off.
First off, he's a fast mothafucka, so keep your distance and deal with the rest of the enemies first.
Once it's just you and him, run near him, and attack, either he'll attack you first, or he'll use Sway. The safest way to win this fight is to get in and out quickly without trying to rack up big combos. Psychopath has a high dodge rate (maybe like 25% of my attacks missed?), and if you miss once, you'll be combo'd down by about 1/2 your hp.
If you can get him on the ground, good, try to keep him there. The worst thing he can do is get back up and knock you back. Quite frankly, you're safer on the ground too, when I fought him, I didn't get hit once when I was down. Most likely, he'll start running around randomly.
Those potions come in handy when you get hit, you don't wanna get below half hp. There's a chance he'll use Chopping hammer, which'll do a good 600-700 damage on you.
Basically, keep yourself above 40% hp, and keep your distance, go in when you know it's safe, you should be okay.
Part 4: Julio
Preparation: Same as last time.
Back to Expert's Road again. Go through the first room.
Second room is much smaller than last time, it's harder to stay away from Psychopath. But he only has 3x hp bars, so it's alot easier. And he does less damage too.
Third + fourth rooms are easy, go through it.
Fifth/final room, prepare for a tough fight. You're going up against Julio, a Soul Bender. Once again, clear the room of other enemies before taking him on.
This boss often summons hazy-Eye Breman, which lowers magic defence and status ailment tolerance, and Ice Saya in combination, which is a tricky combo to get through if you're going after him. I don't recommend you go in there, high chance you'll get frozen and combo'd.
Julio also uses Ghost Step (which makes him invincible, and increases speed), followed by Phantasmal Slayer, which is a very deadly skill, at level 1, it does 1000% magic damage to the foe, and knocks them over. It's tough to dodge too.
If you see him use Ghost Step, start running around randomly, or stay away from him for a few seconds, so it'll be gone by tve time you go near him.
Lure him away from his summons, and combo him, it's easier than last time. But if you miss, you'll probably get hit by him a few times.
-rest of guide in progress-