I saw the empty forums for guides and thought to be nice and give back to the community!
Ascalonian Catacombs [AC] is a great dungeon to learn from so I wanted to write up a guide to help anyone wanting to learn this medium difficulty, medium length dungeon.
For a shortcut to Path Guides, CTRL+F and type: PATH 1, PATH 2, or PATH 3
Here it goes, strap in!
Story Mode
After cutscene, the first door will open to a room of crypts with mobs in them. Open one at a time so you don't get overwhelmed with mobs. When you open the correct crypt, [Champion] Gate Guardian Napa will appear. Easy fight. He'll get his hammer ready, when it glows prepare to dodge his charge attack, otherwise you will get knocked down.
There are a couple trash mobs will be waiting for you after the door opens. I advise focusing Monks and ranged mobs first as they are the most annoying. Have someone dodge the traps and pull the chain to deactivate them. The next room is narrow and has some traps that might kill you if you choose to fight in there. I advise pulling them back to give you the space advantage. After they are killed you head forward to the next gate. You will see by the steps a square pressure plate. If you head back you will see mobs at the top of the stairs. After you take them out, be careful as the next big room is filled with traps on the ground. Have your party ready to fight another champion while one person maneuvers across the room to pull the chain to deactivate traps. The [Champion] Ascalonion Captain that spawns is a straight tank and spank affair. She has a knockdown to watch out for that's all. After you defeat the champion, grab a boulder and run it over to the pressure plate by the
door.
Next room is filled with traps. The gargoyle heads will spit fire at you when you're close, take out any within reach with ranged weapons. Anything you can't destroy, just dodge through the traps and disable them by pulling the chain in the room.
Keep the party moving forward and you'll run into a graveling borrow. Take that out first and take care of the gravelings afterwards. Take out all the trash mobs along the path until you find Eir fighting it out with another [Champion] Ascalonion Captain. After the kill, you'll see a cutscene.
When you're ready to fight the next champ, you can head towards the stairs and start pulling his mobs down to take care of. The [Champion] Ascalonian Lieutenant has a knockdown to watch out for. A chest will spawn after you kill him.
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For the next part, there are 3 mini-boss fights you can do in any order. Here's the order I always use: west, east, north.
Head to west bridge where you will find a couple mobs along the way. If you see any glowing globs on the ground, they will spawn ghosts if you go near them. Take any out along the way so they don't bother you during your boss fight. When you're ready just head up to where [Champion] Master Ranger Nente is for a cutscene.
Any melee can walk up the plank to the pillar he stands on while everyone else can simply range him until he goes into his 2nd stage. When he gets to 3/4 health he will teleport towards the out ledge where you're ranged hitters are. He has a melee knockdown and a pet summon to watch out for. Try your best to dodge his attacks at this stage because they can hurt. When he gets to 1/2 health he'll teleport back to the middle pillar, just repeat until he's dead. Don't forget the chest on the side and then waypoint back to the middle.
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Run towards the east side of the map, clearing any trash mobs along the way, until you reach the next boss - [Champion] The Lovers: Ralena and Vassar.
This upcoming boss fight is probably one of the most difficult encounters in story mode dungeons. The reason is because there are special rules to this fight. The closer they are to one another, the more powerful they are. You can tell they are powering up by little hearts that pop up around them. They will hit HARD in this formation, so you need to keep them separated to normalize their damage. You can use the boulders on the ground to knock them away from each other, but sometimes it gets buggy and doesn't work too well. It really helps if you have party members with some sort of pull or knockback skill. Just work with your group to push/pull them in opposite directions. If you're fighting Ralena, watch out for her projectiles and AOE, just keep moving while dealing damage and you'll be fine. If you're fighting Vassar, it should be easier to tank and spank him while dodging/killing his clones. Do your best to keep them apart if they run back together. Be sure to concentrate on killing at least one so that the other one is powerless. Don't forget the chest when you finish.
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Head back through the hallway and up the path to the north towards [Champion] Kasha Blackblood. When you get to her room just jump down towards her so she doesn't burn you after the cutscene.
This is a really easy boss fight as she'll just stand in the middle of the room while casting AOE everywhere. She'll summon minions and heal up, but I advise to just stack on her and burst her down for a quick kill. Don't forget the loot when you're done.
Head back to the middle of the dungeon to do your final boss fight with [Legendary] King Adelbern. He's real easy to burst down. Just watch out for his pull + AOE combo. If you get pulled just break stun and dodge away. If he is targeting you, he might toss a weapon at you for an insta-down. I recommend dodging, reflecting, or move behind a wall or pillar to avoid it. Sometimes he'll do a very big AOE that you need to get out of asap, otherwise this will be a nice and easy fight.
Good job on completing storymode and unlocking your path to explorable modes!

It just took me 2 hours to write this (
