No tricks to this one, and very straightforward.

 

Starting out, you are dropped into the middle of various enemies. Kill everything, including those that spawn after, the ones that after those, and those after that. After killing everything, the four walls around you will open up. Choose a direction, and proceed. North is De Malmoth, West is Rockbear, East is Wolgadha, and South is Gwanahda.

 

Note, each person in your party must do a different enemy. However, if you're at 3 or less, then you only need to clear that same number of enemies.

 

Kill the boss you went to, then proceed. In the center of the next map, multiple wolves will spawn. Destroy them, then go north, and do the same to the monkeys and elephants. Now, either go East or West. West is Fang Banther, with small minions, and East is Fang Banshee, with King Yedes. 

 

Note, only 2 people can go either way. If you are alone, pick a side and do your best. If your party has 3 total, then one person will have to solo.

 

Dispatch the enemies, all of them, then proceed. Welcome to the Ruins area. Like everything else so far, dispatch all the enemies. After finishing, go North, and step on the switches, one person per switch, and proceed in.

 

In the final area, kill the Dark Ragne and Anti-Darker Coalition Force For Forest Peace and Prosperity (ADCFFFP) that is the Forest enemies already hitting him. Kill them all, and you're done.

 

Side note, at any point you can go back to help others with the bosses. If you notice a person has been fighting De Malmoth or whomever for a long time, and you're in the tundra area ready to continue, you can go back and help them. See infographic on details of which path is which. This same option is open for the Fangs.