From Eden Eternal Wiki
Vileshark HQ is the second dungeon in Beluga Bay and the first 5-player dungeon in the game. Note that boss Axe Moss and Charles will only appear after all other common monsters in the dungeon, specifically the angellies and swordsmen, have been defeated.
Dungeon Length: Long
Vileshark HQ gives players a taste of what it is like to go through a five-man dungeon. It is time-consuming, easy to get lost in, and full of ways to get killed. Players should have a lot of free time on their hands before they even get in a party to do Vileshark. The most problematic of the normal monsters here are called Vileshark Swordsmen. They patrol the dungeon and have a very large amount of HP. Players need to move carefully so as not to attract more than one at any time. Other monsters here can immobilize targets or prevent them from receiving healing. It is highly recommended to have two healers here, just in case if the first healer got some debuffs, the second healer can remove the debuff and heal to make up with the first healer's absence.
It is recommended to kill Kedar first, as the other bosses do not spawn until other requirements have been met. To fully complete the dungeon, the party must defeat every monster on the whole map, or Charles and Axe Moss will not appear.The bosses themselves are not particularly difficult, but they take a long time to reach. Having three weaknesses makes them extra vulnerable to different types of attack. Of the three, Charles is probably the most dangerous, so healers should work overtime during this fight.